Title:
AMPLITUDE MODULATION CIRCUIT
Document Type and Number:
WIPO Patent Application WO/1983/000782
Kind Code:
A1
Abstract:
An amplitude modulation circuit which has no modulation distortion even at high modulation factors while still maintaining its ability of high integration. In an amplitude modulation circuit having a first differential pair (D1) with a constant-current source (S1) and a second differential pair (D2) using one (T1) of the transistors forming the first differential pair (D1) as a common emitter current source, in which a modulation signal is input to one differential pair (D1) and a carrier is input to the other differential pair (D2), a bypass circuit (B) which passes a constant current in proportion to the current of the source(S1) is connected in parallel to the second differential pair (D2) receiving the carrier, so that the operation start point of the second differential pair (D2) is advantageously increased to the vicinity of the starting end of the low frequency band side of the linear range of the AM modulation. Such an amplitude modulation circuit can be used for an RF converter which constitutes the interface between video equipment and a television receiver.
Inventors:
MAEDA TETSUHIRO (JP)
HOSOYA NOBUKAZU (JP)
HOSOYA NOBUKAZU (JP)
Application Number:
PCT/JP1982/000321
Publication Date:
March 03, 1983
Filing Date:
August 17, 1982
Export Citation:
Assignee:
SANYO ELECTRIC CO (JP)
International Classes:
H03C1/06; H03C1/36; (IPC1-7): H03C1/36
Foreign References:
| JPS50153854A | 1975-12-11 |
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