Abstract: An amplifier circuit (100) includes a driver stage ( ) 120 with at least an active device (140) for pre-amplification and output of a pre-amplified signal; and an output stage (160) with at least an active device (180) for further amplification of the pre-amplified signal and output of an amplified signal. A phase shifter (155) shifts the phase of the pre-amplified signal. A detector (190) measures levels of forward and reflected parts of the amplified signal, and a gain and phase control circuit (145) independently and selectively controls and adjusts the phase shifter (155) for optimal amplifier performance and minimal difference between the forward and reflected signals. The gain and phase control circuit also independently and selectively controls and modifies the gain of the active devices (140, 180) of the driver and output stages (120, 160) as a function of the levels of the forward and reflected signals to substantially maintain constant linearity of the amplifier circuit (100) with load variations.

Abstract: Estimation of gain and phase imbalance of an upconverting transmitter. A transmitter transmits symbols containing vector components of pre-specific relationship in an analog signal. A receiver (also contained in a transceiver along with the transmitter) examines the symbols to determine the phase and gain imbalances in the transmitter based on the analog signal. An aspect of the present invention enables the balance estimation circuit to be integrated along with the transmitter and the receiver into a single monolithic integrated circuit.

Abstract: Systems and methods relating to the provision of gain, phase and delay adjustments to signals to be used by a predistortion subsystem. A portion of an input signal is delayed by delay elements prior to being received by the predistortion subsystem. The delayed input signal portion is also received by a feedback signal processing subsystem that adjusts the gain and phase of the feedback signal based on the delayed input signal portion. The adjusted feedback signal is used, along with the delayed portion of the input signal, to determine an appropriate predistortion modification to be applied to the input signal.

Abstract: An amplifier circuit comprises a first amplifier having an input and an output. A second amplifier has an input that communicates with an output of the first amplifier. A third amplifier has an input that communicates with an input of the first amplifier. A fourth amplifier has an input that communicates with an output of the third amplifier and an output that communicates with the input of the second amplifier. A switched capacitance circuit selectively couples a capacitance to at least one of the input of the third amplifier and the output of third amplifier.

Abstract: Control loops in a voltage regulator can be stabilized using minimal silicon area. A current limit signal, generated by a current limit control loop in the voltage regulator, can be divided to minimize a zero provided in a compensation set associated with a voltage control loop, thereby stabilizing both loops. The compensation set can include a resistor (the zero) and a capacitor (a pole) connected in series between output and input terminals of an amplifier. Dividing the current limit signal can include injecting a first portion of the current limit signal on a first side of the resistor and injecting a second portion of the current limit signal on a second side of the resistor. The ratio of the first and second portions can be based on a gain of the amplifier, thereby minimizing an effect of the resistor.

Abstract: An amplifier apparatus in which a signal is amplified by an amplifier and distortion produced by the amplifier is compensated for, that can continue to operate even in cases where the amplitude of a distortion component contained in the amplified signal after distortion compensation has become large. Distortion component amplitude detection means 7 and 8 detect the amplitude of distortion components produced by the amplifier 4 that are contained in signals amplified by the amplifier 4 after distortion compensation, and when the amplitude of a detected distortion component exceeds a predetermined threshold value, amplified signal level reduction control means 9 and 1 perform control to reduce the level of the signal amplified by the amplifier 4.

Abstract: Systems and methods relating to the provision of gain, phase and delay adjustments to signals to be used by a predistortion subsystem. A portion of an input signal is delayed by delay elements prior to being received by the predistortion subsystem. The delayed input signal portion is also received by a feedback signal processing subsystem that adjusts the gain and phase of the feedback signal based on the delayed input signal portion. The adjusted feedback signal is used, along with the delayed portion of the input signal, to determine an appropriate predistortion modification to be applied to the input signal.

Abstract: A technique for peak suppression, phase and amplitude equalizer of multi-carrier signals with different modulation is described. The input to the multi-carrier power amplifier is modified by a peak suppression, phase and amplitude equalizer circuit prior to being applied to the amplifier. The peak suppression is applied to a multi-carrier signal with different modulations and bandwidth. After peak suppression each individual carrier is phase and amplitude equalized to maintain the properties of the multi-carrier signal. The phase equalizer maintain the timing property of the carriers and the amplitude equalizer maintain the modulation accuracy of the individual carriers. The input to the peak-to-average reduction circuit could be a baseband, an intermediate frequency (IF) or radio frequency (RF) signal. The peak-to-average reduction is performed in digital domain.

Abstract: An amplifier circuit amplifies a signal inputted from an input terminal. A first feedback circuit is placed across an emitter of a bipolar transistor and an input of the amplifier circuit. A second feedback circuit is placed across the input and an output of the amplifier circuit for feeding the output of the amplifier circuit back to the input of the amplifier circuit. A phase change amount in the feedback circuit is determined by the values of an inductor and a capacitor. The values of these elements are selected so that a phase of a signal in which fundamental waves included in two feedback signals are combined and a phase of a signal in which second harmonics included in the two feedback signals are combined are shifted by approximately 180 degrees from a phase of a fundamental wave of an input signal.

Abstract: A pulse modulation power converter comprising a forward path including a forward block (15), a switching stage (11) for amplifying an output from the forward block, and an output filter (12) for low pass filtering an output signal from the switching stage, a global feedback path (13), connected to the low pass filtered output signal, comprising a global feedback block (18, 19) for generating a feedback signal, and means (14) for subtracting said feedback signal from an input signal, and feeding the result to said forward path. The global feedback block and/or forward block includes means for compensating at least a portion of a phase lag of said output filter, and means for obtaining a 180 degrees phase lag at a switching frequency, thereby achieving conditions for a controlled oscillation at said switching frequency. The control system combines the advantages of the self-oscillation technology with a high gain, wide-band control loop for suppressing non-linearities.

Abstract: Systems, methods, and devices relating to the provision of deliberate predistortion to an input signal to compensate for distortions introduced by an amplifier subsystem. An input signal is received by a signal processing system which includes a predistortion subsystem. The input signal is decomposed and the fragments are then predistorted by the predistortion subsystem by applying a deliberate predistortion to the fragments. The predistorted fragments are then separately processed and recombined to arrive at the system output signal. The predistortion subsystem adaptively adjusts based on characteristics of the system output signal. Also, the predistortion subsystem is equipped with a control system that is state based—the state of the predistortion subsystem is dependent upon the prevailing conditions and, when required, the control system switches the state of the predistortion subsystem.

Abstract: An apparatus and a system, as well as a method and an article, may include detecting an indication of an amplifier output signal amplitude and responsively adjusting the amplifier input signal phase to reduce a change in the phase of the output signal.

Abstract: A distortion compensating circuit for a power amplifier attains raised compensating accuracy with shorter convergence time by accurately and quickly generating a distortion compensation signal for pre-distortion. An error signal representing the difference between the input and output signals of the power amplifier is generated. From the error signal and the input signal, the coefficients of the third-order intermodulation distortion, fifth-order intermodulation distortion and seventh-order intermodulation distortion are calculated. According to these coefficients, a distortion compensating signal which is characteristically opposite in phase and gain to the intermodulation distortions is generated.

Abstract: An RF signals amplification block receives a first RF signal, and comprises means of amplification of this first RF signal so as to deliver a second, amplified, RF signal. This signal must be amplified by a predetermined nominal power so as to be delivered at the output of the block. The block comprises means of measurement of the power of the second, amplified, RF signal, means of coupling the amplified RF signal to a first output of the block, a control signal generated by a central processing unit for controlling the coupling means. The invention also relates to an RF signals transmission device intended to be arranged at the focus of RF signals focusing means comprising a block according to the invention and an RF signals transmission antenna/terminal. Particular application to the tracking of nonsynchronous satellites.

Abstract: A signal is applied to the body of a MOSFET to enhance the transconductance of the MOSFET. The signal applied to the body of the MOSFET has essentially the same waveform as an input signal supplied to the gate of the MOSFET, and is shifted by approximately 180 degrees with respect to the input signal. The signal applied to the body of the MOSFET may be provided by a phase-adjusting feedback circuit that generates the signal from a signal representing the output of the MOSFET.

Abstract: Frequency stabilization of chopper-stabilized amplifiers using multipath hybrid double-nested Miller compensation. The compensation may provide a desired 6 dB/oct roll off for both instrumentation amplifiers and operational amplifiers. Various embodiments are disclosed.

Abstract: An amplifier circuit includes a first amplifier module that includes an input and an output and that has first gain, a first bandwidth and a first output impedance. A second amplifier module includes an input that communicates with the input of the first amplifier module and an output and has a second gain that is less than the first gain, a second bandwidth that is greater than the first bandwidth and an output impedance that is less than the first output impedance. A capacitance communicates with the output of the second amplifier module and an output of the first amplifier module. The second amplifier module includes an operational transconductance amplifier.

Abstract: A multistage amplifying device for amplifying a desired signal comprise first to N-th amplifiers connected in cascade,wherein the k-th (k is 1 to N) amplifier includes a k-th amplification section; and a k-th feedback section which has a reactance component, changes a phase of a signal output from the k-th amplification section. When a phase difference between the desired signal output from the N-th amplifier and a third-order inter-modulation distortion(IM3) output from the (N?1)-th amplifier is referred to as a first phase, and a phase difference between the desired signal output from the N-th amplifier, and a combined IM3 obtained by combining a IM3 occurring in the N-th amplification section and a IM3 fed back from the N-th feedback section is referred to as a second phase, a difference between the first phase and the second phase is 120° or more and 180° or less.

Abstract: A filter circuit includes a plurality of integrator stages, each stage including a voltage-to-current converter to convert an input voltage into a current supplied to an output thereof and a capacitor coupled to the output of the voltage-to-current converter, a voltage charged in the capacitor being supplied to a next stage as an output of each stage, and a capacitor serving as a feed-forward coupling that couples the output of at least one stage of the plurality of integrator stages to a last output node.

Abstract: A nested transimpedance amplifier (TIA) circuit comprises a zero-order TIA having an input and an output. A first transconductance amplifier has an input that communicates with said output of said zero-order TIA and an output. A first feedback resistance has one end that communicates with said input of said zero-order TIA and an opposite end that communicates with said output of said first transconductance amplifier. A first feedback capacitance has a first end that communicates with said input of said zero-order TIA and a second end that communicates with said output of said zero-order TIA. A capacitance has one end that communicates with said input of said zero-order TIA.

Abstract: An amplifier circuit comprises a first operational transconductance (OTA) having an input and an output and a second OTA having an input that communicates with an output of the first OTA. A third OTA has an input that communicates with an input of the first OTA. A fourth OTA has an input that communicates with an output of the third OTA and an output that communicates with the input of the second OTA. A switched capacitance circuit selectively couples a capacitance to at least one of the input of the third OTA and the output of third OTA.

Abstract: Stability compensation for an amplifier with adjustable gain is provided via adjustable capacitance coupled to an input of a gain element within the amplifier. Gain of the amplifier is adjusted by an adjustable resistance coupled between the input and output of the gain element. The adjustable capacitance and the adjustable resistance determine the frequency of a dominant pole of the amplifier.

Abstract: Reducing a non-linearity effect of a power amplifier includes receiving signals at off-line inverse and forward models. The signals include an input signal, a pre-distorted signal, and an output signal. The output signal exhibits distortion with respect to the input signal, where the distortion includes an impairment effect and a non-linearity effect. The impairment effect is reduced in accordance with the signals. A memory depth of the power amplifier is estimated in accordance with the signals to generate memory information. Non-linearity of the power amplifier is estimated in accordance with the memory information. Pre-distortion information is calculated according to the estimated non-linearity. The non-linearity effect is reduced using the pre-distortion information.

Abstract: A technique for Crest Factor reduction and amplitude pre-distortion of multi-carrier signals is described. The input to the multi-carrier amplifier is modified by a Crest Factor reduction and amplitude pre-distortion circuit, prior to being applied to the amplifier. The Crest Factor reduction and amplitude pre-distortion circuit first clips the amplitude of the signal, converts the clipped signal to baseband to produce the baseband representative of each carrier, filters each baseband representative to remove the unwanted signals, up converts each baseband representative to its multi-carrier baseband frequency and finally the up converted signals are combined to produce the multi-carrier baseband signal. The Crest Factor reduction and amplitude pre-distortion circuit next pre-distort the amplitude of the signal using a look up table before applying the signal to the amplifier.

Abstract: A circuit is provided that includes a Cartesian feedback loop. The Cartesian feedback loop includes one or more operational amplifiers. At least one of the operational amplifiers includes two or more cascaded amplifier stages and one or more bypass amplifier stages. The bypass amplifier stages are connected in parallel with the cascaded amplifier stages.

Abstract: RF phase distortion circuits and methods for controllably phase distorting an RF signal based on amplitude of the RF signal. An MOS device is provided having a body of a first conductivity type and at least one region of a second conductivity type in the body, with a conductive layer over at least part of the body and the region of the second conductivity type and insulated therefrom. The MOS device may be coupled into a phase distortion circuit individually or in back-to-back pairs and biased to invert the body under the conductive layer for small signal amplitudes and not for large signal amplitudes, or to not invert the body under the conductive layer for small signal amplitudes and to invert the body under the conductive layer for large signal amplitudes. Various embodiments are disclosed.

Abstract: The invention concerns a method for maintaining an optimal operating point of an LDMOS device stable, said LDMOS device producing an output signal including an error signal component. The method comprises separating said error signal component from the output signal of said LDMOS device and using said error signal component for controlling the gate-to-source bias voltage, or Vgs, of said LDMOS device to maintain the optimal operating point of the LDMOS device stable.

Abstract: A dual feedback topology imparts stability to a multistage linear amplifier, particularly by improving overall amplifier phase margin at higher signal frequencies. With dual feedback, an inner feedback loop is closed around the first amplifier stage, which stage is configured as a current feedback amplifier. A second feedback loop is closed around the overall multistage amplifier. With a current feedback amplifier as the initial stage, the two feedback signals are current-mode signals and thus add to form the combined feedback signal. The frequency responses of the inner and outer feedback loops may be tailored for flat frequency response, or, where desired, may be adjusted to compensate or otherwise flatten overall amplifier frequency response.

Abstract: Systems and methods relating to the provision of gain, phase and delay adjustments to signals to be used by a predistortion subsystem. A portion of an input signal is delayed by delay elements prior to being received by the predistortion subsystem. The delayed input signal portion is also received by a feedback signal processing subsystem that adjusts the gain and phase of the feedback signal based on the delayed input signal portion. The adjusted feedback signal is used, along with the delayed portion of the input signal, to determine an appropriate predistortion modification to be applied to the input signal.

Abstract: A complex low-pass filter that reduces the influence of component mismatch. The filter includes a first filter section for effecting a first single pole transfer function and a second filter section for effecting a second single pole transfer function, where the first and the second single pole transfer functions collectively define a conjugate pair of poles. In higher order low-pass filters, an optimal cascade order follows a shoestring pattern.

Abstract: Systems, methods, and devices relating to the provision of deliberate predistortion to an input signal to compensate for distortions introduced by an amplifier subsystem. An input signal is received by a signal processing system which includes a predistortion subsystem. The input signal is decomposed and the fragments are then predistorted by the predistortion subsystem by applying a deliberate predistortion to the fragments. The predistorted fragments are then separately processed and recombined to arrive at the system output signal. The predistortion subsystem adaptively adjusts based on characteristics of the system output signal. Also, the predistortion subsystem is equipped with a control system that is state based—the state of the predistortion subsystem is dependent upon the prevailing conditions and, when required, the control system switches the state of the predistortion subsystem.

Abstract: Systems, methods, and devices relating to the provision of deliberate predistortion to an input signal to compensate for distortions introduced by an amplifier subsystem. An input signal is received by a signal processing system which includes a predistortion subsystem. The input signal is decomposed and the fragments are then predistorted by the predistortion subsystem by applying a deliberate predistortion to the fragments. The predistorted fragments are then separately processed and recombined to arrive at the system output signal. The predistortion subsystem adaptively adjusts based on characteristics of the system output signal. Also, the predistortion subsystem is equipped with a control system that is state based—the state of the predistortion subsystem is dependent upon the prevailing conditions and, when required, the control system switches the state of the predistortion subsystem.

Abstract: Systems and methods relating to the provision of gain, phase and delay adjustments to signals to be used by a predistortion subsystem. A portion of an input signal is delayed by delay elements prior to being received by the predistortion subsystem. The delayed input signal portion is also received by a feedback signal processing subsystem that adjusts the gain and phase of the feedback signal based on the delayed input signal portion. The adjusted feedback signal is used, along with the delayed portion of the input signal, to determine an appropriate predistortion modification to be applied to the input signal.

Abstract: Briefly, an apparatus having an outphasing modulator that may provide at least first and second outphased signals to a power amplifier. The outphasing modulator may control amplitude of the first and second outphased signals by an amplitude modulation controller which may vary an amplitude level of first and second control signals base on a desired output power level of said power amplifier.

Abstract: A current-to-voltage converting apparatus connected to an element or a circuit having a first terminal connected to a signal source and comprising a feedback amplifier, which is connected to a second terminal of the element or the circuit and keeps the second terminal at virtual ground, and which converts the current signals that flow to the element or the circuit to voltage signals and outputs these signals; a device for opening the feedback loop of the feedback amplifier and measuring the open-loop loss of the feedback loop; and a compensating amplifier, which compensates for the open-loop loss. It further comprises a device for measuring the open-loop phase shift of the feedback loop when the feedback loop is open and a control unit for keeping the open-loop phase shift at a pre-determined value.

Abstract: A power splitter receives power and has a first and second power output. The first power output is connected first power limiting section. A first matching circuit connects between an output of the first power limiting section and a first phase shifter. A second phase shifter connects between the second power output and a second power limiting section. An output of the second limiting section connects to a second matching circuit. A power combiner receives the output of the first phase shifter and the second matching circuit output. The power from the power combiner is delivered to the load.

Abstract: Systems and methods relating to the provision of gain, phase and delay adjustments to signals to be used by a predistortion subsystem. A portion of an input signal is delayed by delay elements prior to being received by the predistortion subsystem. The delayed input signal portion is also received by a feedback signal processing subsystem that adjusts the gain and phase of the feedback signal based on the delayed input signal portion. The adjusted feedback signal is used, along with the delayed portion of the input signal, to determine an appropriate predistortion modification to be applied to the input signal.

Abstract: The present invention provides an active low-pass filter system including a low-pass filter circuit and at least one frequency-rejecting network coupled to the low-pass filter circuit. The frequency-rejecting network is included in a resistive forward signal flow branch of the low-pass filter. The present invention also provides a power amplifier system for driving a load. The power amplifier system includes a pulse width modulation circuit which creates ripple spectra, an error amplifier and modulator circuit, and a demodulation filter connected in series, and a feedback control loop coupled to the pulse modulation circuit and including an active low-pass filter having a feedback demodulation filter and an isolated-integrator frequency-rejecting network.

Abstract: A radio frequency feedback amplifier circuit of high linearity within the range of frequencies with which the circuit is to be used includes a high gain amplifier incorporating a bandpass filter in the form of a single resonator which may be tunable, connected in the forward path of the amplifier stage and tuned so that its resonant frequency is at substantially the signal frequency, and a linear passive feedback circuit. A tuning arrangement (64, 65, 66, 67) includes phase detection elements (66), such as a Gilbert cell, for determining the phase shift across the resonator (62) and for adjusting a variable capacitance (64, 65) within the resonator (62) to tune the resonant circuit, in dependence on the frequency of the input to the circuit. Such an amplifier circuit may be used to achieve high linearity and stability at reasonable manufacturing cost, with much greater simplicity than can be achieved using other feedback techniques.

Abstract: A signal to be amplified is provided in polar format comprising an amplitude component (210) and a phase component (212). The amplitude component (210) is used to bias the phase component (212). The gain of amplifier (220) depends upon the bias of the signal that it receives. Therefore, the bias given to the phase component (212) provides the envelope characteristics of the output signal (224) of amplifier (220). Both (or either) of the amplitude component (210) and the phase component (212) may be predistorted (226, 310) to eliminate distortion appearing in the output signal (224).

Abstract: A low pass notch filter has a notch frequency close to &ohgr;o. In the notch filter, an output of an operational amplifier is fed back to an inverting input terminal thereof through a second voltage dividing circuit and a charge/discharge resistor. A first voltage dividing circuit is connected between a signal input terminal and a capacitor which is connected to the inverting input terminal. A signal from the output of the operational amplifier to the second voltage dividing circuit is fed back to a divided output point of the first voltage dividing circuit through a capacitor. At the same time, the signal input terminal provides a signal to the non-inverting input terminal of the operational amplifier through a third voltage dividing circuit.

Abstract: An improved method and apparatus for using parallel amplifiers to efficiently amplify an information signal are disclosed. The improved apparatus utilizes digital signal manipulation techniques in optimizing the phase of the upconverted input signals provided to each of the parallel amplifiers. The phase and amplitude of the input signals are adjusted such that the power measured at the output of a combiner is maximized as compared to the sum of the power of combiner input signals.

Abstract: An amplifier distortion reduction system obtains a distortion signal from the amplifier output and feeds the distortion signal back to the input side of the amplifier to cancel with the distortion produced at the amplifier output. For example, a signal to be amplified by an amplifier is received on a main signal path. The amplifier produces an amplified output with a non-distortion spectrum and a distortion spectrum. A sample of the amplified output is produced from the main signal path and placed on a feedback path. On the feedback path, the distortion spectrum is obtained from the sample amplified output. The distortion spectrum is phase and/or amplitude adjusted to produce the distortion signal. The distortion signal is placed onto the main signal path at the input side of the amplifier with the signal to be amplified to destructively combine with the distortion produced from the amplifier in amplifying the signal to be amplified.

Abstract: In a receiver, provision is made of a tuneable switchable bandpass filter comprising a primary resonant circuit and a first secondary resonant circuit. A second secondary resonant circuit can be switched into a part of the first primary resonant circuit, thereby producing a second primary resonant circuit. By virtue of the embodiment of the primary resonant circuit, the bandpass filter is switchable in terms of frequency range with little outlay on circuitry and, on account of the individual embodiment of a first and second secondary resonant circuit with individual coupling elements, can be optimized with regard to a constant amplitude response.

Abstract: Phase shifting network (110) predistorts the input to non-linear amplifier (114) to counteract AM-PM distortion. The input signal is sampled at (116) and its amplitude is detected at (118). The amplitude signal is then used to index a lookup table (122) which contains corresponding data for controlling the phase shifting network (110). The input signal may be digital and the phase shifting process may be implemented in the digital domain.

Abstract: The invention includes an integrated circuit chip having a closed loop control module. The closed loop control module includes a power amplifier coupled to a feedback control circuit. The power amplifier linearly amplifies a communication signal based on a modified control signal received from the feedback circuit. To produce the modified control signal, the feedback circuit may receive from the power amplifier a passive representation of the power amplifier collector current or an active representation of the power amplifier collector current. The feedback control circuit takes the collector current representative signal received from the power amplifier and compares to a voltage control signal. The comparison results in a signal that is passed through a loop integrator to create the modified control signal use to control the amplification of the communication signal in the power amplifier. A feedback saturation detecting circuit may be fixed about the loop integrator to prevent saturation.

Abstract: An isolator eliminator for a linear transmitter receives a plurality of digital samples of an information signal and a drive signal sampled from a feedback loop at periodic time intervals and, responsive to processing the digital samples, provides high accuracy phase and level correction signals to the feedback loop. The phase and level correction signals maintain stable, linear operation of the feedback loop and limit splatter. In a preferred embodiment, the isolator eliminator includes a digital signal processor such that multiple communication protocols may be accommodated by changing software code executed by the processor.

Abstract: The present invention relates generally to the problem of linearization in electronic amplifiers, and more particularly to the problem of controlling phase shift in these systems. The invention measures the outgoing phase difference, directly or indirectly, and then rotates the Cartesian system accordingly to adjust the phase error in the system to within a few degrees. The phase difference can be measured in different places in the system as can the performance of the Cartesian rotation. The rotation is necessary to make the system unconditionally stable independent of the phase difference between the main amplifier path and the reference path. The invention achieves stabilization of the phase in a power amplifier, thereby eliminating the need for time-consuming adjustments and also allows the achievement of higher bandwidths since the phase control is very accurate.

Abstract: A significant part of the cost of a base station in the cellular mobile radio system is the power amplifier. Thus it is desirable to maximise usage of a power amplifier and in particular to gain the best power output from the amplifier or to improve its efficiency. Such power amplifiers, however, must operate within strict spectral boundaries and thus power amplifiers are typically over-specified in order to ensure that the spectral requirements are met. By measuring the output of the amplifier and determining distortion factors and then adaptively adjusting the operating characteristics of the amplifier, the degree of over-specification of the amplifier required may be reduced with consequent cost and environmental savings.

Abstract: A method and device are configured for providing for both quick and accurate signal settling. A high accuracy component is configured in parallel with a high speed component. The high accuracy component may be an op-amp. The high speed component may be an OTA that is configured to be a non-linear OTA. Furthermore, an ADC is configured to internally provide both quick and accurate signal settling. For example, an ADC comprises an internal high speed OTA configured in parallel with a connected external op-amp. The OTA is configured to be a non-linear OTA.