Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Patent
1994-03-03
1995-08-29
Urban, Edward F.
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
342 20, 455317, H04B 128, G01S 736, G01S 7285
Patent
active
054469236
ABSTRACT:
A mixer is provided having a mixing element, an input signal port for incoming signals at a frequency f.sub.IN, a local oscillator signal port for signals from a local oscillator having a fundamental frequency f.sub.LO, and an output port from which the resultant frequency may be taken. Means are provided to impose a DC component of bias voltage across the mixing element at one of three levels. The mixer is such that it has a pair of conduction threshold voltages which are substantially symmetrical above and below zero volts, beyond which the mixing element will be conductive at least when a signal from the local oscillator is imposed on it. The signal from the local oscillator has substantially sinusoidal voltage waveform, with a peak-to-peak voltage which is greater than the voltage difference between the pair of conduction threshold voltages. When the first zero DC component bias voltage is imposed across the mixer element, the mixing element is conductive in respective symmetrical positive-going and negative-going senses, and the maximized resultant frequency is .vertline.f.sub.IN .+-.2f.sub.LO .vertline.. When the second DC component of bias voltage is imposed across the mixing element, it conducts only once per cycle of local oscillator voltage, so that the maximized resultant frequency is .vertline.f.sub.IN .+-.f.sub.LO .vertline.. When the third DC component of bias voltage is imposed across the mixing element, the value of voltage across the mixing element exceeds the threshold voltage in the same sense as the voltage shift for about 35% to about 55% of the period of the local oscillator voltage cycle making the mixer conductive, but it is also conductive in the opposite sense for at least a portion of the remaining period of the cycle, so that third harmonic mixing occurs, and the maximized resultant frequency is .vertline.f.sub.IN .+-.3f.sub.LO .vertline..
REFERENCES:
patent: 4313216 (1982-01-01), Jaeger et al.
patent: 4630054 (1986-12-01), Martinson
patent: 4952936 (1990-08-01), Martinson
patent: 4961074 (1990-10-01), Martinson
patent: 5146227 (1992-09-01), Papadopoulos
patent: 5268689 (1993-12-01), Ono et al.
Sedra et al., "Microelectronic Circuits", 1982, pp. 130-132.
Burin Marian M.
Martinson Glen D.
B.E.L.-Tronics Limited
Hewson Donald E.
Urban Edward F.
Wisler Mark D.
LandOfFree
Mixer using fundamental frequency or second or third harmonic fr does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Mixer using fundamental frequency or second or third harmonic fr, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mixer using fundamental frequency or second or third harmonic fr will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1827729