Increased sensitivity signal shaper circuit to recover a data stream coming from a digitally modulated channel
US5565812A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 23, 1995 |
| Grant date | Oct 15, 1996 |
| Priority date | — |
| Expiry date | Mar 23, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K5/02
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
In a remote control system, a receiver demodulates an incoming signal that is typically RF into a digital signal. Signal shaping is required in order to transform small AC signal variations into clean, full-level digital signals. An increased sensitivity signal shaper circuit uses AC coupling with a fully differential architecture. A capacitor couples the input signal to a fully differential operational amplifier where a feedback capacitor sets the gain and a switched capacitor sets the time constant and operating point. The differential operational amplifier has a differential output that is fed into a single ended output comparator that is followed by a schmidt trigger which restores the signal to full logic levels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.