Switched capacitor amplifier circuit having bus precharge capabi

Details Switched capacitor amplifier circuit having bus precharge capabi Switched capacitor amplifier circuit having bus precharge capabi

1999-03-26

2000-10-31

Pascal, Robert

Amplifiers

With periodic switching input-output

327124, 341158, H03F 102

Patent

active

061408719

ABSTRACT:
An amplifier circuit for amplifying a difference between first and second input signals which is capable of precharge a node at which the second input signal is present thereby enhancing the speed of operation. The circuit includes a first amplifier stage and a capacitor having one terminal coupled to the amplifier stage input. Switching circuit, typically in the form of various transistor switches, operates to switch the first input signal to the second terminal of capacitor. The amplifier stage output is then coupled to the second node thereby charging the node to a voltage approximately equal to input signal voltage. The second input signal is then coupled to the precharged second node. Assuming that the second signal magnitude is related to the magnitude of the first input signal, as it would be in certain Analog-To-Digital Converter applications, the second signal will be able to rapidly change the voltage from the first input signal voltage level to the second input voltage level.

REFERENCES:
patent: 4210872 (1980-07-01), Gregorian
patent: 4438354 (1984-03-01), Haque et al.
patent: 5084639 (1992-01-01), Ribner
patent: 5459464 (1995-10-01), Beneteau et al.
patent: 5661240 (1997-08-01), Kemp
patent: 5880630 (1999-03-01), Iwamoto et al.
"Principles of Data Conversion System Design" by Behzad Razavi, (1995) Chapter 3, pp. 29-44.
"Principles of Data Conversion System Design" by Behzad Razavi, (1995) Chapter 8, pp. 198-231.

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