Method and apparatus for increasing the high frequency sensitivi

Details Method and apparatus for increasing the high frequency sensitivi Method and apparatus for increasing the high frequency sensitivi

1990-03-13

1992-05-12

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307271, 3072191, 328 15, 328 16, 333218, G06G 700, H03B 1900

Patent

active

051130947

ABSTRACT:
A method and apparatus comprising a sampler frequency converter having a first and a second diode. A local oscillator having a frequency F.sub.LO, a step recovery diode and a balun transformer are used for providing positive and negative sampling pulses to the diodes for sampling an input signal applied to the diodes having a frequency F.sub.IN. An output signal is provided by the diodes having a frequency F.sub.OUT which is defined by the relationship F.sub.OUT .vertline.F.sub.IN .+-.N.times.F.sub.LO .vertline. where N is an integer harmonic number 1, 2, 3 . . . and the output signal has an amplitude which varies as a function of (sin x)/x where x=F.sub.IN. A bandpass filter is provided which is responsive to the output signal for filtering a predetermined band of frequencies therefrom and a bias circuit is provided for forward biasing the diodes so that the frequency F.sub.IN of said input signal at which nulls occur in said (sin x)/x relationship occur at a lower frequency after said biasing than before said biasing.

REFERENCES:
patent: 3376495 (1968-04-01), Leonard
patent: 3397369 (1968-08-01), Uhlir, Jr. et al.
patent: 3829797 (1974-08-01), Karkar et al.
patent: 4504791 (1985-03-01), Conway et al.
patent: 4513250 (1985-04-01), Harman
patent: 4638180 (1987-01-01), Sagawa et al.

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