Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Patent
1994-08-18
1995-11-07
Urban, Edward F.
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
455330, 327355, H04B 128
Patent
active
054654203
ABSTRACT:
A non-linear active device (32), such as a FET, multiplies multiplicand signals to generate a product signal. A combining circuit (24) combines multiplicand signals into a combined signal. An input matching and conditioning network (28) couples the combined signal to an input of the active device (32). This network (28) matches impedances between sources for the multiplicand signals and the active device (32) at the frequencies of the multiplicand signals, and desirably shorts the product signal's frequencies. A feedback resistor (36) couples between the output and input of the active device (32) to lower impedance at the output and to stabilize the active device (32). An output matching and conditioning network (40) couples a mixed signal from the output of the active device to an output circuit (42). This network (40) matches impedances between the output circuit (42) and the active device (32) at the frequencies of the product signal, and desirably shorts the multiplicand signals' frequencies.
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Stephen A. Maas "Microwave Mixers" Artech House, 1993.
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P. Bur, "70 MHz to 6 GHz Upconverter," Electron Lett., vol. 17.
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R. Dessert, P. Harrop, B. Kramer and T. Vlek "All-FET Front End for 12 GHZ Satellite Broadcasting Reception," Proc. 8th Annual European Microwave Conf., 1978, p. 638.
Dougherty Richard M.
Fraser Glenn R.
Bogacz Frank J.
Handy Robert M.
Motorola Inc.
Nehr Jeffrey D.
To Doris
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