| 摘要 |
A transconductance difference amplifier (300) is described, for providing an output current dependent upon a difference between a first input voltage (302) and a second input voltage (304). The difference amplifier comprises an input sampling capacitor (306) having two conductors; a transconductance amplifier (312) having an input (318) coupled to a first conductor of said input sampling capacitor and a current output (314) for generating said output current; and an input switch (308, 310) for selectively coupling a second conductor of said input sampling capacitor to a first input of said difference amplifier for receiving said first input voltage and to a second input of said difference amplifier for receiving said second input voltage. The difference amplifier couples said second conductor to one of the inputs and applies a voltage to said first conductor and then couples said second conductor to the other input to provide a voltage change to said transconductance amplifier input dependent upon said input voltage difference.
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