System and Method for Adjusting the Sensitivity of a Capacitive Signal Source
First Claim
Patent Images
1. A system for amplifying a signal provided by a capacitive signal source, the system comprising:
- an impedance converter having an input node configured to be coupled to a first terminal of the capacitive signal source; and
an adjustable capacitive network having a first node configured to be coupled to a second terminal of the capacitive signal source and a second node coupled to an output node of the impedance converter.
1 Assignment
0 Petitions
Accused Products
Abstract
In accordance with an embodiment, a system for amplifying a signal provided by a capacitive signal source includes an impedance converter having an input node configured to be coupled to a first terminal of the capacitive signal source, and an adjustable capacitive network having a first node configured to be coupled to a second terminal of the capacitive signal source and a second node coupled to an output node of the impedance converter.
-
Citations
27 Claims
-
1. A system for amplifying a signal provided by a capacitive signal source, the system comprising:
-
an impedance converter having an input node configured to be coupled to a first terminal of the capacitive signal source; and an adjustable capacitive network having a first node configured to be coupled to a second terminal of the capacitive signal source and a second node coupled to an output node of the impedance converter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. An integrated circuit comprising:
-
a voltage buffer having an input node configured to be coupled to a first terminal of a MEMS microphone; and an adjustable capacitive network having a first node configured to be coupled to a second terminal of the MEMS microphone, a second node coupled to an output node of the voltage buffer, an adjustment input configured to adjust a capacitance of the adjustable capacitive network. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
-
-
23. A method of calibrating a MEMS microphone having a first node coupled to voltage buffer circuit, the method comprising:
-
applying an acoustic signal to the MEMS microphone; measuring a sensitivity of the MEMS microphone and the voltage buffer circuit; and correcting a gain of the MEMS microphone and the voltage buffer circuit, correcting the gain comprising adjusting a capacitance of a capacitive network coupled between an output of the voltage buffer circuit and a second node of the MEMS microphone. - View Dependent Claims (24, 25, 26, 27)
-
Specification