Abstract: An input device processing system comprises a sensor module that transmits a first transmitter signal with a transmitter electrode and receives a resulting signal with a receiver electrode. The first transmitter signal comprises a first transmitter frequency, and the resulting signal comprises effects corresponding to the first transmitter signal. A demodulation module demodulates the resulting signal to produce a first signal (e.g., an upper sideband signal) and a second signal (a lower sideband signal), selectably determines a first measurement of a change in capacitive coupling between the transmitter electrode and the receiver electrode based on at least one of the first and second signals, and determines positional information for an input object based on the first measurement.

Abstract: A voltage reference circuit includes three or more current mirrors, an operational amplifier, a voltage buffer, two or more diodes, and one or more resistors. The operational amplifier has two inputs separately coupled to an output of two of the three or more current mirrors and an output coupled to the three current mirrors. The voltage buffer has an input coupled to an output of the other one of the three or more current mirrors and another input coupled to an output of the voltage buffer. Each of the diodes is coupled between the output of the two of the three or more current mirrors and one of ground and a negative supply. The one or more resistors are coupled to an output of one or more of the three or more current mirrors to tune effects of input current and establish a first set absolute voltage and temperature coefficient on a voltage reference.