Frequency doubler having adaptive biasing

Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Frequency or repetition rate conversion or control

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377 45, 377 47, 327175, 327227, H03K 3033, H03K 378, H03K 2108

Patent

active

053651812

ABSTRACT:
A frequency doubler having adaptive biasing includes one shot circuits 10 and 12, which are responsive to particular transitions of an input signal for generating pulsed signals at each such transition. The widths of the pulses are determined by the magnitude of a bias current supplied to the one shot circuits. The pulsed signals of one shot circuits 10 and 12 are combined by OR gate 14 to provide an output signal whose frequency is twice the frequency of the input signal. A low-pass filter 16, coupled to the output signal, produces a signal which is a measure of the average voltage level of the output signal. Voltage-to-current converting FET 18, responsive to the average voltage level of the output signal, supplies bias current to one shots 10 and 12. Comparators 20 and 22 detect when the average voltage level is not within a predetermined range, and enable either up or down counting of digital counter 24. The binary-related outputs of counter 24 drive the individual gate electrodes of switching FET's 40 through 48, which provide supplemental bias currents to one shots 10 and 12 corresponding to the count of counter 24. The channel widths of FET's 40 through 48 are scaled in accordance with the binary weighting of their corresponding counter outputs, and the channel of voltage-to-current converting FET 18 is substantially wider than the smallest channel of the switching FET's 40 through 48.

REFERENCES:
patent: 3569732 (1971-03-01), Christensen
patent: 4052626 (1977-10-01), Tuma et al.
patent: 4639679 (1987-01-01), Kasperkovitz et al.

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