H - Electricity – 03 – G
Patent
H - Electricity
03
G
330/21
H03G 11/00 (2006.01) H03F 3/45 (2006.01)
Patent
CA 1180774
ABSTRACT A limiter amplifier suitable for use in a paging receiver is described. The amplifier does not use coupling capacitors and can therefore be manufactured as a monolithic integrated circuit. Furthermore, it is capable of obtaining a favourable saturation characteristic even when operated by a low-voltage power source such as a single dry battery. Finally temperature variations have virtually no effect on the new amplifier. The amplifier comprises a power supply, two or more cascade-connected differential amplifiers for amplitude limiting and input. Each differential amplifier has a first constant current circuit. A biassing circuit is connected to an input of the cascaded differential amplifiers to supply thereto a biassing voltage. The biassing circuit has a second constant current circuit. A third constant current circuit is provided for activating the first and second constant current circuits. A voltage regulator is connected to the power supply a constant voltage to the three constant current circuits. The voltage regulator has the same characteristic with respect to temperature variations as the three constant current circuits.
405008
Nagata Koichi
Oda Takashi
Nippon Electric Co. Ltd.
Smart & Biggar
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