Multi-path analog system with multi-mode high-pass filter
US10009039B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 18, 2017 |
| Grant date | Jun 26, 2018 |
| Priority date | — |
| Expiry date | Aug 18, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/0626
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A system may comprise a high-pass filter having an input for receiving an input signal, an output for generating an output signal, a capacitor coupled between the input and the output, a switched-capacitor resistor coupled between the output and a reference voltage, and control circuitry configured to control the reference voltage to cancel current leakage into a circuit coupled to the output. The input, the output, the capacitor, and the switched-capacitor resistor may be arranged to generate the output signal as a high-pass filtered version of the input signal and the high-pass filter may be configured to operate in a plurality of modes comprising at least a high-impedance mode and a low-impedance mode in which the resistance of the switched-capacitor resistor is significantly smaller than the resistance when in the high-impedance mode.A system may include a plurality of processing paths having a first path configured to generate a first digital signal based on an analog input signal and a second path configured to generate a second digital signal based on the analog input signal, the second path having a high-pass filter for filtering the analog input signal prior to the analog …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.