Modulators
US10298247B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 13, 2018 |
| Grant date | May 21, 2019 |
| Priority date | — |
| Expiry date | Mar 13, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K7/08
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
This application relates to analog-to-digital converter (ADC) circuitry (200). A time-encoding modulator (TEM 201) has a comparator (104) and a loop filter (105) configured to generate a pulse-width-modulated (PWM) signal (SPWM) in response to an input signal (SIN) and a feedback signal (SFB). A controlled oscillator, such as a VCO (202) receives the PWM signal and generates an output oscillation signal (SOSC) with a frequency that varies based on a drive signal at a drive node (109), e.g. a drive node of a ring oscillator (107). The controlled oscillator (202) comprises at least one control switch (112) controlled by a switch control signal (S1) generated from the received PWM signal so as to control the drive strength of the drive signal applied to the drive node (109). The feedback signal (SFB) for the TEM (201) is derived from the controlled oscillator (202) so as to include any timing error between the PWM signal and the switch control signal (S1) applied to said control switch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.