Multiple ultrasonic preamplifiers with independent automatic gain control
US9157996B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | May 3, 2012 |
| Grant date | Oct 13, 2015 |
| Priority date | — |
| Expiry date | Jun 28, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S15/87
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Multiple signals are received from multiple receivers in a motion sensor. Each signal is amplified and undergoes a gain adjustment individually to generate multiple preamplified received ultrasonic signals. A separate demodulator circuit receives a different preamplified received ultrasonic signal and generates a sum of the demodulated signals and a difference between the demodulated signals. A low pass filter corresponding to a demodulator circuit removes the sum of the demodulated signals. The mixer circuit combines the difference between the demodulated signals to generate an integrated circuit. The gain of each preamplifier may be adjusted based on a sensitivity setting, target levels of the preamplifier, and a level of a preamplified ultrasonic signal, resulting in an integrated motion sign that originated from multiple signals to different receivers in the sensor housing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.