Patent ID: 11954286
Assignee: SHENZHEN GOODIX TECHNOLOGY CO., LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 11:
12. The system of claim 1, further comprising:
a plurality of instances of the Vin node, each to couple with a respective channel of the plurality of channels, such that each ith instance of the Vin node (Vin_i) represents a voltage across the ith respective Ci (Ci_i) of the ith respective channel coupled thereto;
a plurality of instances of the discharge stage, wherein each ith instance of the discharge stage is configured to couple the Vin_i with an ith locally noise-suppressed discharge current (Iout_i) during a discharge phase to discharge the Vin_i to an ith respective discharge voltage level, each ith respective discharge voltage level being the first voltage level in absence of a touch event local to the ith respective channel and being the second voltage level in presence of the touch event local to the ith respective channel; and
a plurality of instances of the sensing stage coupled with the plurality of instances of the discharge stage, wherein each ith instance of the sensing stage is configured to output an ith respective voltage output (Vout_i) for the ith respective channel by passively mixing at least the ith discharge voltage level to produce an ith pair of up-converted channel signals, sampling the ith pair of up-converted channel signals to obtain an ith differential voltage sample, and amplifying the ith differential voltage sample to generate an ith voltage output instance indicating absence or presence of the touch event local to the ith respective channel.