Charge domain capacitance digital conversion circuit

• Main Authors: HE NINGYE, CHEN ZHENHAI, NING RENXIA, BAO JIE, CHENG WENJUAN, LYU HAIJIANG
• Format: Patent
• Language: Chinese; English
• Published: 11.01.2017
• Subjects: BASIC ELECTRONIC CIRCUITRY; CODE CONVERSION IN GENERAL; CODING; DECODING; ELECTRICITY

The invention provides a charge domain capacitance digital conversion circuit which is characterized by comprising a reference voltage generation module, a charge domain analog-to-digital converter, a charge domain voltage-to-charge amplification circuit and a clock generation circuit. The charge domain voltage-to-charge amplification circuit amplifies received differential voltage signals Vip and Vin to acquire Qop and Qon and outputting the Qop and the Qon to a differential analog charge input end of the charge domain analog-to-digital converter; and the charge domain analog-to-digital converter converts the received differential charges to acquire digital quantitative codes. The charge domain capacitance digital conversion circuit can be widely applied to various kinds of capacitive sensing systems such as various kinds of touch screens. 本发明提供了种电荷域电容数字转换电路，其特征是包括：基准电压产生模块、电荷域模数转换器、电荷域电压转电荷放大电路和时钟产生电路。电荷域电压转电荷放大电路将接收到的差分电压信号Vip和Vin进行放大处理得到Qop和Qon并输出到电荷域模数转换器的差分模拟电荷输入端；电荷域模数转换器将接收到的差分电荷进行转换得到数字量化码。该电荷域电容数字转换