Abstract: An amplification circuit in accordance with the present invention includes an amplifier comprising four inputs. Each of the four inputs is operable to receive a respective analog signal and a respective DC bias signal. Also included is supply circuitry for providing a first and second controlled DC bias signal. Each of the DC bias signals is operable to couple to selected ones of the four inputs of the amplifier.

Abstract: A temperature constant Gm current reference circuit which is also independent of voltage across the circuit which includes a circuit for applying a substantially identical voltage to a semiconductor diode as well as to a branch circuit comprising a polysilicon resistor of predetermined doping level in series with plural unidirectional current carrying devices connected in parallel, preferably in the form of a multi-electrode transistor. From eight to twelve such unidirectional current carrying devices are required in the preferred embodiment.

Abstract: A folded cascode amplifier with rail-to-rail common-mode range utilizes a fully differential input with two sets of input common source amplifier devices to allow rail-to-rail common-mode range. The first set of devices utilizes N-channel transistors (28) and (32) to provide operation in one direction and P-channel transistors (38) and (42) to allow operation in the other direction. Two common gate amplifier output legs are provided for generating a differential voltage between an output node (50) and an output node (48) in a cascode configuration. A feedback circuit is provided for maintaining node (50) at analog ground over the full common-mode range of the input voltage. The feedback circuit utilizes a current source with transistors (88) and (90) and a differentially configured set of transistors (80) and (82) to control a feedback transistor (86).

Abstract: A voltage reference circuit (10) produces a reference voltage at output terminals (66, 76). The output reference voltage is substantially independent of variations in the supply voltage, integrated circuit manufacturing processes and temperature. A current reference circuit (30, 32, 34, 36, 38, 56 and 84) produces constant emitter currents in bipolar transistors (40, 70). The V.sub.BE of the bipolar transistors (40, 70) is a stable reference due to the constant emitter current. The bipolar transistors (40, 70) are manufactured with similar geometries to eliminate dependence of the reference voltage upon bipolar processing variations. The V.sub.BE of the bipolar transistor (40) produces a reference current which is provided to the base terminal of bipolar transistor (70). The V.sub.BE of bipolar transistor (70) is further utilized to produce the output reference voltage.

Abstract: A charge coupled device transversal filter having split electrodes each having a sense portion and a complementary dummy portion. All electrode sense portions are coupled to a single sense line and all dummy portions are connected to a reference voltage. Tap weights are determined by relative lengths of successive sense portions and weighted samples are taken by shifting charge packets from one sense electrode position to a second while sensing the difference in displacement charge induced in successive sense electrodes. The structure is less sensitive to manufacturing tolerances than earlier structures and provides a sense signal with essentially no common mode component to a sense amplifier.