Abstract: A remote differential voltage sensing circuit having a voltage input (Vin) and a voltage output (Vout), comprises a dual differential input stage including a common-source or common-collector differential input stage in parallel with a common-gate or common-base differential input stage. The common-source or collector differential input stage has differential inputs, one coupled to the voltage input (Vin) and the other coupled to the voltage output (Vout). The common-gate or common-base differential input stage has differential inputs, one coupled to a local ground (Agnd) and the other coupled to a remote ground (Rgnd). An output stage is driven by an output of the dual differential input stage and produces an output voltage at the voltage output (Vout). A compensation network is coupled between the voltage output (Vout) and the output of the dual differential input stage.

Abstract: Systems, semiconductor structures, electronic circuits and methods for enhanced transient response in Low Dropout (LDO) voltage regulators are disclosed. For example, a semiconductor structure for enhanced transient response in an LDO voltage regulator is disclosed, which includes a first current mirror circuit coupled to an input connection and an output connection of the LDO voltage regulator, a second current mirror circuit coupled to the input connection of the LDO voltage regulator. A first input of a first amplifier circuit is coupled to the second current mirror circuit, a second input of the first amplifier circuit is coupled to the output connection of the LDO voltage regulator, and a third input of the first amplifier circuit is coupled to a reference voltage.

Abstract: A remote differential voltage sensing circuit having a voltage input (Vin) and a voltage output (Vout), comprises a dual differential input stage including a common-source or common-collector differential input stage in parallel with a common-gate or common-base differential input stage. The common-source or collector differential input stage has differential inputs, one coupled to the voltage input (Vin) and the other coupled to the voltage output (Vout). The common-gate or common-base differential input stage has differential inputs, one coupled to a local ground (Agnd) and the other coupled to a remote ground (Rgnd). An output stage is driven by an output of the dual differential input stage and produces an output voltage at the voltage output (Vout). A compensation network is coupled between the voltage output (Vout) and the output of the dual differential input stage.

Abstract: An equivalent series inductance (ESL) cancel circuit for a regulator for adjusting a feedback voltage by attenuating a magnitude of a square wave ripple voltage developed on an output voltage. The regulator includes an output inductor and an output capacitor, in which the capacitor has an ESL which forms an inductive voltage divider with the output inductor causing the square wave voltage ripple. The ESL cancel circuit may include first and second current sources and a resistor device coupled between the output node and an adjust node which is further coupled to a feedback input of the regulator. The first current source applies a current proportional to the output voltage to the adjust node. The second current source selectively applies a current proportional to the input voltage of the regulator based on a state of the pulse control signal.

Abstract: Systems, semiconductor structures, electronic circuits and methods for enhanced transient response in Low Dropout (LDO) voltage regulators are disclosed. For example, a semiconductor structure for enhanced transient response in an LDO voltage regulator is disclosed, which includes a first current mirror circuit coupled to an input connection and an output connection of the LDO voltage regulator, a second current mirror circuit coupled to the input connection of the LDO voltage regulator. A first input of a first amplifier circuit is coupled to the second current mirror circuit, a second input of the first amplifier circuit is coupled to the output connection of the LDO voltage regulator, and a third input of the first amplifier circuit is coupled to a reference voltage.

Abstract: A circuit can compensate for intra pair skew or mode conversion in a channel by applying a second or corrective mode conversion effect that counters the channel's mode conversion. The circuit can process the common mode signal with a frequency dependent filter prior to injection back into the differential mode. The circuit can implement the reverse mode conversion with passive circuits using integrated resistors and metal oxide semiconductor (MOS) switches. In certain embodiments, such actions can proceed effectively without necessarily consuming active power.

Abstract: An equivalent series inductance (ESL) cancel circuit for a regulator for adjusting a feedback voltage by attenuating a magnitude of a square wave ripple voltage developed on an output voltage. The regulator includes an output inductor and an output capacitor, in which the capacitor has an ESL which forms an inductive voltage divider with the output inductor causing the square wave voltage ripple. The ESL cancel circuit may include first and second current sources and a resistor device coupled between the output node and an adjust node which is further coupled to a feedback input of the regulator. The first current source applies a current proportional to the output voltage to the adjust node. The second current source selectively applies a current proportional to the input voltage of the regulator based on a state of the pulse control signal.

Abstract: Certain embodiments described herein relate to a scanning controller configured produce a horizontal (H) and vertical (V) scanning control signal that is used to control a bi-axial scanning mirror of a scanning laser projector device, a system including such a scanning controller, and a method for generating such an H and V scanning control signal. In an embodiment, the H and V scanning control signal includes H scanning frequency content that is used to control a H scanning frequency of the bi-axial scanning mirror, and V scanning frequency content that is used to control a V scanning frequency of the bi-axial scanning mirror. To avoid cross talk, the scanning controller is configured to produce the H and V scanning control signal such that the H scanning frequency content has a null at DC, and the V scanning frequency content has a null at the H scanning frequency.

Abstract: Certain embodiments described herein relate to a scanning controller configured produce a horizontal (H) and vertical (V) scanning control signal that is used to control a bi-axial scanning mirror of a scanning laser projector device, a system including such a scanning controller, and a method for generating such an H and V scanning control signal. In an embodiment, the H and V scanning control signal includes H scanning frequency content that is used to control a H scanning frequency of the bi-axial scanning mirror, and V scanning frequency content that is used to control a V scanning frequency of the bi-axial scanning mirror. To avoid cross talk, the scanning controller is configured to produce the H and V scanning control signal such that the H scanning frequency content has a null at DC, and the V scanning frequency content has a null at the H scanning frequency.

Abstract: A circuit can compensate for intra pair skew or mode conversion in a channel by applying a second or corrective mode conversion effect that counters the channel's mode conversion. The circuit can process the common mode signal with a frequency dependent filter prior to injection back into the differential mode. The circuit can implement the reverse mode conversion with passive circuits using integrated resistors and metal oxide semiconductor (MOS) switches. In certain embodiments, such actions can proceed effectively without necessarily consuming active power.

Abstract: A circuit can compensate for intra pair skew or mode conversion in a channel by applying a second or corrective mode conversion effect that counters the channel's mode conversion. The circuit can process the common mode signal with a frequency dependent filter prior to injection back into the differential mode. The circuit can implement the reverse mode conversion with passive circuits using integrated resistors and metal oxide semiconductor (MOS) switches. In certain embodiments, such actions can proceed effectively without necessarily consuming active power.

Abstract: A circuit can compensate for intra pair skew or mode conversion in a channel by applying a second or corrective mode conversion effect that counters the channel's mode conversion. The circuit can process the common mode signal with a frequency dependent filter prior to injection back into the differential mode. The circuit can implement the reverse mode conversion with passive circuits using integrated resistors and metal oxide semiconductor (MOS) switches. In certain embodiments, such actions can proceed effectively without necessarily consuming active power.

Abstract: This invention relates to apparatus and methods for radio receivers, in particular low (IF) frequency receivers. Embodiments of the invention are particularly suitable for digital audio broadcast receivers.

Abstract: A superhet receiver with quadrature IF and improved demodulator is configured to recover a modulated signal from a low IF in a radio receiver. A superhet receiver receives a FM radio-frequency signal, converts the input RF signal to an in-phase IF signal and an IF signal in phase quadrature to the in-phase signal, and outputs the IF signals. A plurality of monostables receive the IF signals and each monostable generates a corresponding output pulse. By combining the monostable output pulses, a complex waveform is generated. The complex waveform includes the demodulated signal and a carrier signal at a significantly higher IF. The complex waveform is filtered to recover the desired modulated signal.

Abstract: A fuse-trimmed tank circuit for an integrated voltage-controlled oscillator (VCO). The tank circuit includes an L-C portion; a cross-coupled pair of transistors, whose collectors are coupled to the L-C portion; a capacitor coupled across the emitters of the cross-coupled pair of transistors; and a pair of resistors, where each resistor is coupled between a corresponding one of the emitters and a ground node. This oscillator circuit provides improved performance over prior oscillator circuits. A technique for trimming the VCO is utilized to adjust its center frequency. Capacitance for the L-C portion of the tank circuit is provided by one or more varactor diodes. When the VCO is operational, the varactors are reverse biased and, thus, act as capacitive elements. One or more of the varactors has an associated fuse coupled in series with the corresponding varactor. To trim the center frequency of the VCO, the capacitance of the L-C portion is adjusted by selectively blowing the fuses.

Abstract: The invention is an improved implementation of an active-RC polyphase band-pass filter with transconductor cross-coupling between filter sections. The polyphase filter has first to fourth inputs, first to fourth outputs, two filter sections, and a block of transconductor pairs. The four input signals to the polyphase filter succeed one another in phase by 90 degrees. The two filter sections have reactances comprised of active balanced operational amplifiers with matched capacitors in their feedback loops. The block of transconductor pairs is coupled between corresponding reactances of each filter. The transconductance of each transconductor pair is set as the product of a desired radian center frequency and the capacitance of the corresponding matched capacitors. In the preferred embodiment, the transconductors are Gm cells and the transconductance of at least one Gm cell is field adjustable.