Back to results
US 9,916,040 B2Granted
Capacitor, first and second current conveyors mirror current into input
AssigneeTexas Instruments Incorporated
InventorsKaran Singh Jain, Harish Venkataraman
Life of this patent
Estimating the term…
Abstract
A bandpass sense amplifier circuit (FIG. 2A) is disclosed. The circuit includes a capacitor (C0) having a first terminal coupled to receive an input signal (Vin) and a second terminal. A current conveyor circuit (200-206,212) has a third terminal (X) coupled to the second terminal of the capacitor and a fourth terminal (Z) arranged to mirror a current into the third terminal. A voltage follower circuit (214) has an input terminal coupled to the fourth terminal of the current conveyor circuit and an output terminal.
Claims11
A circuit, comprising:
- a capacitor having a first terminal coupled to receive an input signal and having a second terminal;
- a first current conveyor circuit having a third terminal coupled to the second terminal of the capacitor and having a fourth terminal arranged to mirror a current into the third terminal;
- and
- a second current conveyor circuit having an input terminal coupled to the fourth terminal of the first current conveyor circuit and having an output terminal arranged to mirror a current into the input terminal.
1 more element
A touch screen system, comprising:
- a voltage source arranged to produce a drive voltage having a frequency;
- a plurality of first electrodes arranged to selectively receive the drive voltage;
- a plurality of second electrodes proximate the plurality of first electrodes;
- a bandpass sense amplifier, including a first current conveyor circuit and a first voltage follower circuit, selectively coupled to the plurality of second electrodes, the first current conveyor circuit including the first voltage follower circuit, and including a second current conveyor circuit, the second current conveyor circuit including a second voltage follower circuit;
- an analog to digital converter (ADC) coupled to receive an output signal from the bandpass sense amplifier;
- and
- a processor coupled to receive an output signal from the ADC.
4 more elements
Dependencies are inferred from the claim text.