TRACK AND HOLD WITH ACTIVE CHARGE CANCELLATION

摘要

A track and hold circuit includes a primary sampling capacitor, a primary switching transistor, and a cancellation transistor. The primary switching transistor is configured to provide a track state that connects an input signal to the primary sampling capacitor and a hold state that isolates the input signal from the primary sampling capacitor. The cancellation transistor is coupled to the primary sampling capacitor. The cancellation transistor is configured to inject a charge onto the primary sampling capacitor that cancels a charge injected onto the primary sampling capacitor by the primary switching transistor while the primary switching transistor is in the hold state.

主权项

1. A track and hold circuit, comprising:
a primary sampling capacitor; a primary switching transistor configured to provide:
a track state that connects an input signal to the primary sampling capacitor; anda hold state that isolates the input signal from the primary sampling capacitor; and a cancellation transistor coupled to the primary sampling capacitor, wherein the cancellation transistor is configured to inject a charge onto the primary sampling capacitor that cancels a charge injected onto the primary sampling capacitor by the primary switching transistor while the primary switching transistor is in the hold state.