Track and hold with active charge cancellation

• Main Authors: ELAMMAS MANAR IBRAHIM, AGGRAWAL HIMANSHU
• Format: Patent
• Language: Chinese; English
• Published: 27.03.2018
• Subjects: BASIC ELECTRONIC CIRCUITRY; CODE CONVERSION IN GENERAL; CODING; DECODING; ELECTRICITY; PULSE TECHNIQUE

In described examples, a track and hold circuit includes a primary sampling capacitor (110), a primary switching transistor (206), and a cancellation transistor (210). The primary switching transistor(206) is configured to provide a track state that connects an input signal (114) to the primary sampling capacitor (110) and a hold state that isolates the input signal (114) from the primary sampling capacitor (110). The cancellation transistor (210) is coupled to the primary sampling capacitor (110). The cancellation transistor (210) is configured to inject a charge onto the primary sampling capacitor (110) that cancels a charge injected onto the primary sampling capacitor (110) by the primary switching transistor (206) while the primary switching transistor (206) is in the hold state. 在所描述的示例中，种跟踪和保持电路包括初级采样电容器(110)、初级开关晶体管(206)和消除晶体管(210)。初级开关晶体管(206)被配置为提供跟踪状态和保持状态，跟踪状态将输入信号(114)连接到初级采样电容器(110)，保持状态将输入信号(114)与初级采样电容器(110)隔离。消除晶体管(210)被耦合到初级采样电容器(110)。消除晶体管(210)被配置为当初级开关晶体管(206)在保持状态时，将电荷注入到初级采样电容器(110)上，该电荷消