Tuning arrangement having a substantially constant frequency dif

Details Tuning arrangement having a substantially constant frequency dif Tuning arrangement having a substantially constant frequency dif

1985-03-25

1986-12-09

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455262, 455264, 455318, 331177V, H04B 126

Patent

active

046285407

ABSTRACT:
A tuning arrangement including a mixer stage, a tunable RF-circuit coupled to an input of said mixer stage, an oscillator circuit, coupled to another input of said mixer stage, having a tunable resonant circuit and, for both circuits, a common tuning to mutually different resonant frequencies, of which at least the circuit having the higher resonant frequency includes, a parallel circuit of, on the one hand, a circuit inductance and, on the other hand, a series arrangement of a tuning capacitor and a padding capacitor. For an acceptable tracking between the resonant frequencies of the two circuits, more specifically in the lower frequency portion of the tuning range, the padding capacitor is shunted by a coil which considerably reduces the effect of the capacitance of the padding capacitor at least in the lower frequency portion of the tuning range.

REFERENCES:
patent: 3354397 (1967-11-01), Wittig
patent: 3370254 (1968-02-01), Keller
patent: 3582791 (1971-06-01), Slavin
patent: 3611154 (1971-10-01), Kupfer
patent: 3889210 (1975-06-01), Matsuura et al.
"Philips Data-Handbook--Components and Material", part 2, 12/82, pp. 19-35.
German Amtsblatt Nr. 69/1981.1.5.

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