RF/microwave oscillator having frequency-adjustable DC bias circ

Details RF/microwave oscillator having frequency-adjustable DC bias circ RF/microwave oscillator having frequency-adjustable DC bias circ

1998-05-21

2000-01-04

Mis, David

Oscillators

With particular source of power or bias voltage

331 96, 331117D, 330286, 333204, H03B 518, H03F 360, H01P 1203

Patent

active

060114460

ABSTRACT:
A frequency-adjustable direct current biasing circuit is disclosed for providing a DC bias voltage or a DC connection to ground for an RF or microwave circuit without substantially affecting the RF or microwave signal of the circuit. The biasing circuit includes a transmission line having a first portion for connection to the RF circuit and a second portion connected to a low-impedance-to-ground structure, such as a bypass capacitor or a DC path to ground. The electrical length between the first and second portions is about 90 degrees. The biasing circuit further includes an open ended tuning stub coupled to the transmission line that has a length that is adjustable. By adjusting the length of the tuning stub, the biasing or grounding circuit can provide better isolation for RF energies at different selected frequencies. Also disclosed herein is a dielectric resonator oscillator (DRO) that uses the frequency-adjustable biasing circuit. Further disclosed is a DRO that includes a FET gate return having an RF-shunted, relatively high resistance coupled to the gate of a field effect transistor by way of a quarterwave transmission line. This improved FET gate return provides for reduced phase noise of the DRO.

REFERENCES:
patent: 2262020 (1941-11-01), Llewellyn
patent: 2453716 (1948-11-01), Llewellyn
patent: 2716222 (1955-08-01), Smullin
patent: 3840828 (1974-10-01), Linn et al.
patent: 4019161 (1977-04-01), Kimura et al.
patent: 4189690 (1980-02-01), Bock et al.
patent: 4310809 (1982-01-01), Buck et al.
patent: 4318064 (1982-03-01), Kach
patent: 4335365 (1982-06-01), Pome
patent: 4518931 (1985-05-01), Rauscher
patent: 4565979 (1986-01-01), Fiedziuszko
patent: 4618836 (1986-10-01), Gannon et al.
patent: 4630004 (1986-12-01), Niehenke et al.
patent: 4736454 (1988-04-01), Hirsch
patent: 5079524 (1992-01-01), Sugawara
patent: 5109205 (1992-04-01), Hart et al.
patent: 5159287 (1992-10-01), Furutani et al.
patent: 5243301 (1993-09-01), Tondryk
patent: 5483206 (1996-01-01), Lohninger
patent: 5736901 (1998-04-01), Nakamura et al.

Affiliated with

Also associated with

Rating

RF/microwave oscillator having frequency-adjustable DC bias circ does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with RF/microwave oscillator having frequency-adjustable DC bias circ, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and RF/microwave oscillator having frequency-adjustable DC bias circ will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1075744