Self-calibration circuit with gyrated output impedance
US8446143B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 6, 2009 |
| Grant date | May 21, 2013 |
| Priority date | — |
| Expiry date | Mar 28, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H11/30
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Various embodiments of a self-calibration circuit may solve the problem that arises in high performance oscilloscopes and in particular, RF oscilloscopes, of internally providing a precision calibration signal without degrading the bandwidth, flatness of the frequency response, and input return loss of the oscilloscope. The self-calibration circuit may be configured to implement an impedance transformation technique where active and passive circuit elements with carefully chosen values are configured in an impedance converter. During self-calibration, switching elements comprised in the self-calibration circuit may be toggled to create a servo loop comprising an amplifier within the circuit, with an attenuator and resistive component acting as feedback elements. The circuit may hence become an impedance gyrator and behave as a precision source with an impedance matching the input impedance of the load circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.