Low-voltage input buffer

Details Low-voltage input buffer Low-voltage input buffer

1997-02-04

2000-07-25

Zweizig, Jeffrey

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Nonlinear amplifying circuit

G06G 712

Patent

active

06094093&

ABSTRACT:
The input buffer circuit achieves open-loop linearization at low voltage by generating diode voltages independently from resistor voltages using two separate amplifiers--a main amplifier to generate the resistor voltages and an auxiliary amplifier to generate the diode voltages. Another component in the input buffer, such as a transconductance amplifier, provides the functionality of adding the diode and resistor voltages together to generate the output signal of the input buffer. The input buffer may be used in a track-and-hold amplifier (TH amp) having open-loop linearization yet requiring low power supply voltage and low power consumption. In one embodiment of the TH amp, two input buffers each receive a differential input and both generate two output signals, where the output signals from one input buffer are out of phase with the output signals from the other input buffer. Two switch circuits each receive one signal from each input buffer and each switch circuit generates an output signal that is accumulated in one of two hold capacitors, when the switch circuit is closed (i.e., track mode). When the switch circuits are open (i.e., hold mode), two output buffers read out the signals accumulated in the hold capacitors as the differential output of the TH amp.

REFERENCES:
patent: 4146844 (1979-03-01), Quinn
patent: 5587689 (1996-12-01), Bowers

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