Capacitance sensing and inductance sensing in different modes
First Claim
Patent Images
1. An apparatus comprising:
- a signal generator to output on a first terminal, a first signal in a first mode and on the first terminal, a second signal in a second mode; and
a charge measuring circuit to;
receive on a second terminal a third signal in the first mode responsive to the first signal being concurrently output at the first terminal by the signal generator, wherein the third signal is representative of an inductance of a sense unit coupled between the first terminal and the second terminal in the first mode;
receive on the second terminal a fourth signal in the second mode responsive to the second signal being concurrently output on the first terminal by the signal generator, wherein the fourth signal is representative of a capacitance of the sense unit coupled between the first terminal and the second terminal in the second mode; and
receive on a third terminal a fifth signal representative of a reference capacitance, wherein the third terminal is decoupled from the second terminal.
3 Assignments
0 Petitions
Accused Products
Abstract
An apparatus for inductive sensing or capacitive sensing is described. The apparatus may include a signal generator to output on a first terminal a first signal in a first mode and a second signal in a second mode. The apparatus may include a charge measuring circuit to receive on a second terminal a third signal in the first mode and a fourth signal in the second mode. The third signal is representative of an inductance of a sense unit coupled between the first terminal and the second terminal. The fourth signal is representative of a capacitance of the sense unit.
-
Citations
20 Claims
-
1. An apparatus comprising:
-
a signal generator to output on a first terminal, a first signal in a first mode and on the first terminal, a second signal in a second mode; and a charge measuring circuit to; receive on a second terminal a third signal in the first mode responsive to the first signal being concurrently output at the first terminal by the signal generator, wherein the third signal is representative of an inductance of a sense unit coupled between the first terminal and the second terminal in the first mode; receive on the second terminal a fourth signal in the second mode responsive to the second signal being concurrently output on the first terminal by the signal generator, wherein the fourth signal is representative of a capacitance of the sense unit coupled between the first terminal and the second terminal in the second mode; and receive on a third terminal a fifth signal representative of a reference capacitance, wherein the third terminal is decoupled from the second terminal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A device comprising:
-
a signal generator to generate a first signal, the signal generator to selectively output the first signal on a first terminal; a phase shifter coupled to the signal generator, the phase shifter to shift a phase of the first signal by approximately 90 degrees to obtain a second signal, the phase shifter to selectively output on the first terminal; and a charge measuring circuit to; measure on a second terminal a third signal on a sense unit when the second signal is concurrently applied to the first terminal of the sense unit by the signal generator, wherein the third signal is representative of a capacitance of the sense unit; measure on the second terminal a fourth signal on the sense unit when the second signal is concurrently applied to the first terminal of the sense unit by the signal generator, wherein the fourth signal is representative of an inductance of the sense unit coupled between the phase shifter and the charge measuring circuit, and measure on a third terminal a fifth signal representative of a reference capacitance, wherein the third terminal is decoupled from the second terminal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
-
-
18. A method comprising:
-
exciting a sense unit with a first signal by a signal generator on a first terminal; measuring, by a charge measuring circuit on a second terminal, a second signal on the sense unit when the first signal is concurrently applied to the first terminal of the sense unit, wherein the second signal is representative of an inductance of the sense unit; exciting the sense unit with a third signal by the signal generator on the first terminal; measuring, by the charge measuring circuit on the second terminal, a fourth signal on the sense unit when the third signal is concurrently applied to the first terminal of the sense unit by the signal generator, wherein the fourth signal is representative of a capacitance of the sense unit; and measuring, by the charge measuring circuit on a third terminal, a fifth signal representative of a reference capacitance, wherein the third terminal is decoupled from the second terminal. - View Dependent Claims (19, 20)
-
Specification