Patent EP0090329A1 successfully refreshed from Google Patents.
EP0090329A1
Expired / Lapsed
EP
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Amplitude modulator
Assignee: Toshiba Corp
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Filing: 1983-03-22
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Granted: —
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Expires: 2003-03-22
Abstract
Abstract An amplitude modulator is disclosed which has first and second differential pairs of transistor (Q6, Q7, Q4, Q5) whose bases are supplied with a carrier signal, and a third differential pair of transistors (Q8, Q9) whose collectors are respectively connected to the common emitters of the first and second differential pairs of transistors and of which one transistor is supplied at a base with a modulating signal. The emitters of the first differential pair of transistors (Q6, Q7) are connected together through the corresponding resistors (R10, R11). The collectors of two transistors (Q6, Q5) which are included in the first and second differential pair of transistors and perform the same phase operation are connected together and further connected to a load resistor (R6).
Inventors
- 👤 Seitaro Shinbara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 19:56
CPC Classifications
H; H03; H03C; H03C1/00; H03C1/52; H03C1/54; H03C1/542; H03C1/545; H03C2200/00; H03C2200/0004; H03C2200/0012; H03C2200/0037; H03C2200/0066; H03C2200/0079
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
140 words
An amplitude modulator comprising first and second differential pairs of transistors; a third differential pair of transistors whose collectors are connected to the emitters of the first and second differential pairs of transistors and whose emitters are connected to a current source, characterized in that a carrier signal is supplied to the bases of the first and second differential pairs of transistors (Q6, Q7, Q4, Q5), the emitters of the first differential pair of transistors (Q6, Q7) are jointly connected through the corresponding resistors (R10, Rll), a modulating signal is supplied to the base of one of the third differential pair of transistors (Q8, Q9), the collectors of the two transistors (Q5, Q6) which are included in the first and second differential pairs and perform the same phase operation are connected together and further connected to a load resistor (R6).
Claim 2
Dependent Claim
140 words
An amplitude modulator comprising first and second differential pairs of transistors; a third differential pair of transistors whose collectors are connected to the emitters of the first and second differential pairs of transistors and whose emitters are connected to a current source, characterized in that a carrier signal is supplied to the bases of the first and second differential pairs of transistors (Q6, Q7, Q4, Q5), the emitters of the first differential pair of transistors (Q6, Q7) are jointly connected through the corresponding resistors (R10, Rll), a modulating signal is supplied to the base of one of the third differential pair of transistors (Q8, Q9), the collectors of the two transistors (Q5, Q6) which are included in the first and second differential pairs and perform the same phase operation are connected together and further connected to a load resistor (R6).
Claim 3
Dependent Claim
34 words
An amplitude modulator according to claim 1, characterized in that said first and second resistors (R10, Rll) have a higher resistance than the emitter resistance of said first differential pair of transistors (Q6, Q7).
Claim 4
Dependent Claim
50 words
An amplitude modulator according to claim 1, characterized in that the emitters of said third differential pair of transistors (Q8, Q9) are connected together through the corresponding third and fourth resistors (R15, R16) having a higher resistance than the emitter resistance of said third differential pair of transistors (Q8, Q9).
Claim 5
Dependent Claim
62 words
An amplitude modulator according to claim 1, characterized in that a modulating signal is supplied to the base of one of said third differential pair of transistors (Q8, Q9), and a carrier signal is supplied to the base of one of said first pair of transistors (Q6, Q7) and to the base of one of said second pair of transistors (Q4, Q5).
Claim 6
Dependent Claim
68 words
An amplitude modulator according to claim 1, characterized in that a differential modulating signal is supplied to the bases of said third differential pair of transistors (Q8, Q9), the collectors of two transistors (Q5, Q6) which are included in the first and second differential pairs of transistors and perform the same phase operation are connected together, and a differentially modulated output is issued from said jointly connected collectors.
References Cited (Backward Citations)
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