Abstract: An integrated circuit (100, 200, 300) includes a voltage-mode driver circuit having an analog on-chip termination and also having a substantially constant output impedance across an operating range of an output voltage of the voltage-mode driver circuit. The voltage-mode driver circuit also has slew rate control of the output voltage.

Abstract: An integrated circuit (100, 200, 300) includes a voltage-mode driver circuit having an analog on-chip termination and also having a substantially constant output impedance across an operating range of an output voltage of the voltage-mode driver circuit. The voltage-mode driver circuit also has slew rate control of the output voltage.

Abstract: The present invention discloses a low voltage rail-to-rail CMOS input stage. The input stage includes a differential pail of P-channel metal oxide semiconductor field effect (PMOS) transistors, which produces differential output current signal. The input stage further includes a pair of N-channel depletion-mode metal oxide semiconductor field effect (NMOS) transistors, coupled to the bulk terminals of the differential pair of PMOS transistors, for receiving an input signal. The depletion-mode NMOS transistors further act as source follower devices to drive the bulk terminals of the differential pair of PMOS transistors.

Abstract: An integrated circuit (200, 300, 500) includes a current mirror having high output impedance and also having an output device with a low drain-to-source saturation voltage.

Abstract: An output stage suitable for low voltage operation and capable of providing an essentially symmetrical rail-to-rail output voltage is disclosed. The output stage includes a first field effect device having a first drain, a first gate, and a first source coupled to a power supply VCC. The output stage further includes a second field effect device complimentary to the first field effect device, having a second drain, a second gate, and a second source coupled to a power supply having a nominal voltage of VEE. Further, the second drain is coupled to the first drain. Also included in the output stage is an output sink network coupled to the second field effect device. The output sink network drives the second field effect device such that a product of a current in the first field effect device and a current in the second field effect device is essentially equal to a predetermined constant during operation of the output stage.

Abstract: Current mode charge pumps having improved power consumption characteristics and reduced peak current requirements. The current mode charge pumps utilize a differential transistor pair with a current source providing the tail current for the differential pair. The differential pair alternately steers the current of the current source through first and second fly capacitors, with additional circuitry coupling the opposite fly capacitor, previously charged, to the output of the charge pump. Selection of the tail current provides for matching of circuit performance with the required charge pump output voltage, the load current to be provided thereby and the start time requirements.

Abstract: The present invention teaches a variety of transconductance circuits formed having a class AB transconductor amplifier coupled in parallel with at least one concave compensation circuit. When the transconductance circuit has only one concave compensation circuit, the concave compensation circuit is designed with no offset so that the concave transconductance gain of the compensation circuit compensates for the convex transconductance gain of the class AB amplifier thereby providing a more linear transconductance circuit. When the transconductance circuit includes multiple concave compensation circuits, they each are designed with an offset chosen such that the combination of the individual concave transfer functions achieve a more linear transconductance circuit.

Abstract: Low voltage current sources having a high effective output impedance over a wide voltage range, including when individual transistors exhibit low output impedance states at low voltages. The low voltage current source replicates its output current and compares the replicated current to the desired current. The error between the replicated current and the desired current is used as feedback to force the output current to equal the desired current.

Abstract: A plurality of amplifying power converter circuits are provided each including a pair of switches being connected between two constant voltage sources and an output node common to each of the switches. Such output node is adapted for connection to a load. Also included is a modulator that serves for opening and closing one of the switches with a first duty cycle and opening and closing another one of the switches with a second duty cycle. The first duty cycle and the second duty cycle are at least partially "overlapped". During modulation, the power converter has a voltage gain at the output node that is greater than unity and exhibits improved distortion characteristics.

Abstract: A method and apparatus for customizing the gain of a closed loop operational amplifier during fabrication to a fixed value. The fabricated circuit includes a feedback resistance and a gain resistance coupled to an operational amplifier core. The feedback resistance is set to a preset value by setting links coupled to resistors which make up the feedback resistance.

Abstract: An amplifier circuit that offers high bandwidth operation and a high slew rate is disclosed. The amplifier circuit may also have an input voltage swing down to the negative rail which is particularly suitable for low voltage applications having a single power source. In one embodiment, the amplifier circuit amplifies a difference voltage between first and second input voltages to produce an output voltage, and includes: an analog voltage-to-current converter for receiving the first and second input voltages and producing complementary current signals; and a complementary mirror output stage coupled to receive the complementary current signals at respective mirror circuits.