DC-DC impedance transformer charge pump
US4745303A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 17, 1987 |
| Grant date | May 17, 1988 |
| Priority date | — |
| Expiry date | Feb 17, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C27/024
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A circuit is disclosed that includes a pair of varactors coupled to an input sample circuit and having an appropriate capacitance during the sample strobe of the input to minimize sampling errors. The varactors are combined with a control switch having an output timed to symmetrically reduce the capacitance to a new value, preferably a value approaching the input capacitance of a field effect transistor which is included in the output circuit. In this way, a noise-free voltage and power gain of CT0/CT1 can be reached, where CT0 is the initial value of the capacitance of the sampling circuit and CT1 is the final value of the capacitance of the sampling circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.