Oscillators – With frequency calibration or testing
Patent
1997-11-17
1999-03-09
Grimm, Siegfried H.
Oscillators
With frequency calibration or testing
331177R, 331179, G01R 2300
Patent
active
058806431
ABSTRACT:
A monolithic high frequency voltage controlled oscillator trimming circuit includes a plurality of capacitance loops selectively connected between a first and second differential input of a voltage oscillator active network. A plurality of diodes, connected in series with the respective plurality of capacitance loops, selectively connect respective capacitance loops between the first and second differential input when forward biased. In a similar fashion, the plurality of diodes selectively disconnect the respective capacitance loops from the first and second differential input when reverse biased. A controller applies a forward biasing voltage to the diode of the selected capacitance loop to connect the capacitance loop to the active network of the voltage controlled oscillator and applies a reverse biasing voltage to the diode of the selected capacitance loop to disconnect the capacitance loop from the active network. The diodes used in the capacitance loops form a switch operable at high frequencies and are formed from a bipolar complementary metal oxide semiconductor electro-static discharge protection diode.
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"Closing The Loop", Jun. 1993, Electronics World + Wireless World, pp. 472-478.
Bjork Christian
Gardenfors Torbjorn
Lantz Martin
Marholev Bojko
Grimm Siegfried H.
Telefonaktiebolaget L M Ericsson
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