Active very-high frequency circuit of the all-pass type utilizing an RC network whose capacitance is the gate-source capacitance of a FET
US5038060A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 16, 1989 |
| Grant date | Aug 6, 1991 |
| Priority date | — |
| Expiry date | Jun 16, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H11/18
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An all-pass type active circuit, realizable in the 8-12 GHz band has an inverting stage formed by a field effect transistor Q.sub.1, to whose gate the input signal V.sub.E is applied through a resistor R constituting the resistance of an RC network, and whose gate-source capacitance C.sub.GS is constitutes the capacitance C of the RC network. The parameters of a negative feedback branch inserted between the input V.sub.E and the output V.sub.S of the inverter, including a resistor R.sub.0 and a transmission line L.sub.0, are chosen so that the elements of Z=R.sub.0, l=.tau.v, R.sub.0 =2/G.sub.M0, where Z is the characteristic impedance of L.sub.0, l is the length of L.sub.0, v is the phase velocity of propagation, .tau. is the transit time of the electrons under the gate of Q.sub.1 and G.sub.M0 is the transconductance of Q.sub.1. The phase shift between V.sub.E and V.sub.S at an operating frequency .omega. is a function of the time constant .tau. of the RC network. Two such all-pass type circuits, fed by a common input signal V.sub.E, and having different respective time constants .tau..sub.1, .tau..sub.2, provide a predetermined phase difference (90.degree.) at .omega. between the…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.