GB844043A - Improvements in or relating to radio receiving circuit arrangements - Google Patents

Improvements in or relating to radio receiving circuit arrangements

Info

Publication number
GB844043A
GB844043A GB7689/59A GB768959A GB844043A GB 844043 A GB844043 A GB 844043A GB 7689/59 A GB7689/59 A GB 7689/59A GB 768959 A GB768959 A GB 768959A GB 844043 A GB844043 A GB 844043A
Authority
GB
United Kingdom
Prior art keywords
transistor
local oscillator
frequency
radio receiving
circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB7689/59A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB844043A publication Critical patent/GB844043A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver

Abstract

844,043. Radio receiving circuits; transistor receiving circuits. PHILIPS ELECTRICAL INDUSTRIES Ltd. March 5, 1959 [March 8, 1958], No. 7689/59. Classes 40(5) and 40(6). A radio receiver comprises a transistor frequency-changer 1 coupled by I.F. transformer 5 to transistor I.F. amplifier 2, which also functions as the local oscillator, the collector and emitter being back-coupled via circuit 3 tuned to the local oscillator frequency. A gain control voltage is applied to the base of transistor 2 from terminal 7, which produces an amplified voltage across resistor 8 in the collector circuit. This is used to vary the impedance of a diode 4, acting as a non-linear resistor, over which the local oscillator voltage is applied to the emitter circuit 9 of the frequency-changer 1, and so enhances the variation in gain. The arrangement may also be used with thermionic valves, in which case the diode 4 is replaced by a non- linear resistor of the ceramic type.
GB7689/59A 1958-03-08 1959-03-05 Improvements in or relating to radio receiving circuit arrangements Expired GB844043A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE844043X 1958-03-08

Publications (1)

Publication Number Publication Date
GB844043A true GB844043A (en) 1960-08-10

Family

ID=6774372

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7689/59A Expired GB844043A (en) 1958-03-08 1959-03-05 Improvements in or relating to radio receiving circuit arrangements

Country Status (1)

Country Link
GB (1) GB844043A (en)

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