H - Electricity
03
G
330/102, 328/28,
H03G 3/20 (2006.01) H03B 5/04 (2006.01) H03G 11/00 (2006.01) H03L 7/093 (2006.01) H03L 7/12 (2006.01)
Patent
CA 1176718
PHB 32711 -13- ABSTRACT: An amplifier circuit arrangement suitable for use in phase lock loops incorporated in radio receivers, particularly portable receivers. The amplifier circuit arrangement comprises an inverting and a non-inverting amplifier connected between a common input and respective inputs of a summing circuit. The gains of the amplifiers are unequal for low amplitude input signals but are arranged to produce substantially equal antiphase limited outputs for high amplitude input signals. By making the gains of the amplifiers greater than the difference between their gains a rapid transition is obtained form a situa- tion where the gain corresponds to the numerical differ- ence between the amplifier gains to one where it has fallen to a low level. This property can be used in a phase lock loop of which four examples are given; when the beat frequency output of a phase sensitive detector con- nected to the input of the amplifier arrangement is large, the output of the summing circuit will be low. Conversely, when the phase sensitive detector falls to a low level indicating that a frequency lock is obtained the output of the summing circuit will be high.
380634
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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