US3681619A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Operational video circuit modules
Assignee: Office de Radiodiffusion-Television Francaise
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Filing: 1972-02-04
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Granted: 1972-08-01
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Expires: 1992-02-04
Abstract
Abstract Operational video circuit modules in microelectronic form connectable to other operational video circuit modules performing the same or a different function. The standards concern the admissible peak-to-peak amplitude of the video signals (1 volt), the direct current component amplitude 0.5 volt, the stray direct current output (5 millivolts) for a zero direct current input. Means are provided for cancelling the stray direct current output in each module by means of a temperature-compensated current injector transistor feeding an impedance (resistance or transistor) connecting said injector transistor to the output circuit.
Inventors
- 👤 Maurice A Remy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:07
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/14; H; H03; H03F; H03F3/00; H03F3/30; H03F3/3083; H03F3/3084; H03F3/34; H03F3/343; H03F3/347; H03F3/45; H03F3/45071; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/60; H04; H04N; H04N5/00; H04N5/14; H04N5/148
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
188 words
An operational video circuit module in microelectronic form and connectible to other operational video circuit modules intended to process video signals having a maximum peak-to-peak amplitude of about 1 volt and a direct-current component comprised between +0.5 and -0.5 volt, said module having an output direct-current signal lower than 5 millivolts for a zero direct-current input signal, comprising: an input stage including at least one input transistor connected to an input terminal; an output stage including at least one output transistor connected to an output terminal; a feedback impedance connecting said output terminal to said input stage; a current injector transistor connected between said impedance and a point at a fixed potential of said module, and at least one transistor connected in diode arrangement for biasing and temperature compensating said injector transistor; and means for adjusting the current injected from said injector transistor so as to cancel the stray output direct-current signal of said module when its direct-current input signal is zero: said module being characterized in that said output stage comprises two series-connected transistors forming a shuntregulated amplifier and having said output terminal for their common point.
Claim 2
Dependent Claim
188 words
An operational video circuit module in microelectronic form and connectible to other operational video circuit modules intended to process video signals having a maximum peak-to-peak amplitude of about 1 volt and a direct-current component comprised between +0.5 and -0.5 volt, said module having an output direct-current signal lower than 5 millivolts for a zero direct-current input signal, comprising: an input stage including at least one input transistor connected to an input terminal; an output stage including at least one output transistor connected to an output terminal; a feedback impedance connecting said output terminal to said input stage; a current injector transistor connected between said impedance and a point at a fixed potential of said module, and at least one transistor connected in diode arrangement for biasing and temperature compensating said injector transistor; and means for adjusting the current injected from said injector transistor so as to cancel the stray output direct-current signal of said module when its direct-current input signal is zero: said module being characterized in that said output stage comprises two series-connected transistors forming a shuntregulated amplifier and having said output terminal for their common point.
Claim 3
Dependent Claim
23 words
An operational video circuit module as claimed in claim 1, in which said input stage includes two transistors combined into a Darlington circuit.
Claim 4
Dependent Claim
43 words
An operational video module as claimed in claim 1, in which said input and output stages both include switching transistors each working in either of blocked and saturated conditions and in which said impedance is that the collector-emitter path of said injector transistor.
Claim 5
Dependent Claim
176 words
An operational video circuit module in microelectronic form and connectible to other operational video circuit modules intended to process video signals having a maximum peak-to-peak amplitude of about 1 volt and a direct-current component comprised between +0.5 and -0.5 volt, said module having an output direct-current signal lower than 5 millivolts for a zero direct-current input signal, comprising: an input stage including two input transistors having their bases respectively connected to two input terminals; an output stage includIng at least two output transistors in series connection and connected to an output terminal; a feedback impedance connecting said input stage to said output stage; a first current injector transistor series-connected with the emitter-collector paths of both said input transistors, and at least one transistor connected in diode arrangement for biasing and temperature compensating said first current injector transistor together with a second current injector transistor; said module being characterized in that said impedance is that of the emitter-collector path of a compensating transistor, the base of which is collected to the collector of said second injector transistor.
Claim 6
Dependent Claim
176 words
An operational video circuit module in microelectronic form and connectible to other operational video circuit modules intended to process video signals having a maximum peak-to-peak amplitude of about 1 volt and a direct-current component comprised between +0.5 and -0.5 volt, said module having an output direct-current signal lower than 5 millivolts for a zero direct-current input signal, comprising: an input stage including two input transistors having their bases respectively connected to two input terminals; an output stage includIng at least two output transistors in series connection and connected to an output terminal; a feedback impedance connecting said input stage to said output stage; a first current injector transistor series-connected with the emitter-collector paths of both said input transistors, and at least one transistor connected in diode arrangement for biasing and temperature compensating said first current injector transistor together with a second current injector transistor; said module being characterized in that said impedance is that of the emitter-collector path of a compensating transistor, the base of which is collected to the collector of said second injector transistor.
Claim 7
Dependent Claim
29 words
An operational video circuit module as claimed in claim 4, in which said output stage includes a further transistor forming a Darlington circuit with one of said output transistors.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |