Active very-high frequency circuit of the all-pass type utilizin

Details Active very-high frequency circuit of the all-pass type utilizin Active very-high frequency circuit of the all-pass type utilizin

1989-06-16

1991-08-06

Callahan, Timothy P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307262, 328 55, 328167, 330277, H03B 100, H03F 316

Patent

active

050380605

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 their respective outputs V.sub.S1, and V.sub.S2.

REFERENCES:
patent: 4525680 (1985-06-01), Pan et al.
patent: 4591802 (1986-05-01), Asazawa
patent: 4878033 (1989-10-01), Wong
S. K. Altes et al., "Monolithic RC All-Pass Networks with Constant--Phase--Difference Outputs", IEEE Transactions on Microwave Theory and Techniques, vol. MTT-34, No. 12, Dec. 1986, pp. 1533-1537.

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