H - Electricity – 03 – J
Patent
H - Electricity
03
J
365/13
H03J 3/06 (2006.01) G06G 7/18 (2006.01)
Patent
CA 1042120
ABSTRACT OF THE DISCLOSURE Disclosed is a varactor tuning system having a delinearization circuit for compensating for the non- linearity of the varactor diodes. The system includes a keyboard, a memory, circuitry for addressing the memory in accordance with actuation of the keyboard and a digital-to-analog converter for generating a signal variable in accordance with the data at the addressed memory location. The variable signal is delinearized to form the varactor control signal. The first stage of the circuit includes a first analog switch, which is switchable in accordance with a pulse train, the duty cycle of which is a function of the stored tuning data, between a given supply voltage and ground, to form a first signal. An intermediate signal, which is a function of the first signal, such as the time average thereof, is formed. The second stage includes a second analog switch, which is switchable in accordance with the variable duty cycle pulse train, between an inter- mediate signal and ground to form an output signal proportional to the square of the input pulse train. In a second embodiment, a maximum value circuit is utilized such that the output signal will be linearly proportional to the input signal for a selected range and proportional to the square of the input signal for the remainder of the range.
298161
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