Low distortion RF switching circuit without DC bias

Details Low distortion RF switching circuit without DC bias Low distortion RF switching circuit without DC bias

1986-09-05

1988-08-16

Myracle, Jerry W.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324311, 455 82, 455 83, G01R 3320

Patent

active

047647264

ABSTRACT:
During a transmit cycle portion, a radio frequency transmitter (C) continuously generates an AC biasing signal and selectively generates a radio frequency signal. The AC biasing signal gates a first switch (10) and a second switch (32) such that the radio frequency signals from the transmitter are conducted to a magnetic resonance probe (E) but are blocked from being conducted to a receiver (F). A first filter (20) prevents the bias signals from being applied to the probe. The second switch includes a pair of crossed diodes (34, 36) which are gated conductive by the AC bias signal. A filter (72) passes the radio frequency signals but not the bias signals to ground to prevent the radio frequency signals from reaching the receiver. A filter (80) allows the bias signals to be applied across a load (88) such that the transmitter sees the load at the bias signal frequency. Another filter (40) prevents the bias signal from reaching the transmitter. An additional switch (50) provides further isolation between the receiver and the transmitter during the transmit cycle portion. During the receive cycle portion, radio frequency signals received by the probe pass through the filters (20,40) directly to the receiver but are blocked by switch (10) from passing to the transmitter.

REFERENCES:
patent: 2962584 (1960-11-01), Lackoff
patent: 3039048 (1962-06-01), Shoolery
patent: 3452299 (1969-06-01), Angel
patent: 4075552 (1978-02-01), Traficante et al.
patent: 4408162 (1983-10-01), Egger
patent: 4452250 (1984-06-01), Chance et al.
patent: 4467282 (1984-08-01), Siebold
patent: 4558425 (1985-12-01), Yamamoto
Kan, S. et al., "A Versatile and Inexpensive Electronic System for a High Resolution NMR Spectrometer", Review of Scientific Instruments, vol. 44, No. 12, Dec. 1973.
"Quadrature Detection Coils-A Further .sqroot.2 Improvement in Sensitivity", by Chen, Hoult & Sank; J. of Mag. Res. 54, pp. 324-327 (1983).

Affiliated with

Also associated with

Rating

Low distortion RF switching circuit without DC bias does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Low distortion RF switching circuit without DC bias, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low distortion RF switching circuit without DC bias will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-602339