Double switched track-and-hold circuit
AssigneeHittite Microwave Corporation
InventorMichael J. Hoskins
Life of this patent
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Abstract
A double switched track-and-hold circuit includes an input buffer having a first switched amplifier circuit for passing an input signal in a track mode and isolating the input signal from a buffer output in a hold mode, and a track-and-hold core circuit responsive to the input buffer and having a second switched amplifier circuit for tracking the input signal in a track mode and isolating the input signal from a track-and-hold output in a hold mode. The first and second switching amplifier circuits turn off approximately simultaneously during the hold mode to provide enhanced isolation.
Claims25
A double switched track-and-hold circuit, comprising:
- an input buffer having a first switched amplifier circuit for passing an input signal in a track mode and isolating the input signal from an output of the input buffer in a hold mode;
- and
- a track-and-hold core circuit responsive to the input buffer and having a second switched amplifier circuit for tracking the input signal in a track mode and isolating the input signal from a track-and-hold output in a hold mode, the first and second switching amplifier circuits turning off approximately simultaneously during the hold mode to provide enhanced isolation.
A differential double switched track-and-hold circuit, comprising:
- an input buffer having a first differential switched amplifier circuit for passing a differential input signal in a track mode and isolating the input signal from a buffer output in a hold mode;
- and
- a track-and-hold core circuit responsive to the input buffer and having a second differential switched amplifier circuit for tracking the input signal in a track mode and isolating the input signal from a track-and-hold output in a hold mode, the first and second differential switching amplifier circuits turning off approximately simultaneously during the hold mode to provide enhanced isolation.
An input buffer circuit, for a track-and-hold core circuit having a switched amplifier circuit for tracking the input signal in a track mode and isolating the input signal from a track-and-hold output in a hold mode, the input buffer circuit comprising:
- a switched amplifier circuit for passing an input signal in a track mode and isolating the input signal from a buffer output in a hold mode;
- and
- a clamping circuit for clamping the output signal during the hold mode and for diverting current from the switched amplifier circuit of the input buffer in the hold mode.
Dependencies are inferred from the claim text.