Frequency doubling oscillator and mixer circuit
US4810976A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 13, 1987 |
| Grant date | Mar 7, 1989 |
| Priority date | — |
| Expiry date | Aug 13, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03B2200/0098
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An oscillator of balanced design in which a resonant impedance network is connected between the control ports of two matched transistors, and a capacitance is connected in parallel, across the two inputs of these transistors. The inputs of the transistors are connected each to a matched current source. The signals at the transistor outputs are summed together at a common node. Signals of resonant frequency in each arm of the oscillator are equal in magnitude but opposite in phase. Signals at resonant frequency thus cancel whereas signals at the second harmonic frequency add constructively and are thus enhanced. The effect is a net frequency doubling. For high frequency operation, bipolar transistors are utilized. The current sources can be modulated and an IF mixer output derived. Signal of resonant frequency can be extracted and used for signal prescaling. In an equivalent arrangement, an inductance and resonant network replace the resonant network and capacitance just mentioned.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.