Method and apparatus for increasing the high frequency sensitivity response of a sampler frequency converter
US5113094A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 13, 1990 |
| Grant date | May 12, 1992 |
| Priority date | — |
| Expiry date | Mar 13, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D7/02
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.