GB1251671A - - Google Patents
Info
- Publication number
- GB1251671A GB1251671A GB1251671DA GB1251671A GB 1251671 A GB1251671 A GB 1251671A GB 1251671D A GB1251671D A GB 1251671DA GB 1251671 A GB1251671 A GB 1251671A
- Authority
- GB
- United Kingdom
- Prior art keywords
- gate
- capacitor
- drain
- providing
- beta
- 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
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H11/00—Networks using active elements
- H03H11/02—Multiple-port networks
- H03H11/24—Frequency-independent attenuators
- H03H11/245—Frequency-independent attenuators using field-effect transistor
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06G—ANALOGUE COMPUTERS
- G06G7/00—Devices in which the computing operation is performed by varying electric or magnetic quantities
- G06G7/12—Arrangements for performing computing operations, e.g. operational amplifiers
- G06G7/16—Arrangements for performing computing operations, e.g. operational amplifiers for multiplication or division
- G06G7/163—Arrangements for performing computing operations, e.g. operational amplifiers for multiplication or division using a variable impedance controlled by one of the input signals, variable amplification or transfer function
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G1/00—Details of arrangements for controlling amplification
- H03G1/0005—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal
- H03G1/0035—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements
- H03G1/007—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements using FET type devices
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Power Engineering (AREA)
- Software Systems (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Networks Using Active Elements (AREA)
Abstract
1,251,671. Variable attenuators; amplitude modulation; transistor frequency doublers. PLESSEY CO. Ltd. 17 Jan., 1969 [30 Jan., 1968], No. 4716/68. Headings H3R, H3T and H4R. The non-linearity of the drain current/sourcedrain voltage characteristic of a field effect transistor is corrected by combining the F.E.T. with a second F.E.T. having a biasing arrangement between the gate and drain electrodes, providing a characteristic of opposite curvature, so that the combined characteristic is linear. The F.E.T.s may be connected in series or in parallel. Fig. 4 shows an embodiment of two insulated gate F.E.T.s connected in parallel with the biasing provided, at ac, with capacitor C. The capacitor is connected to a potentiometer between source and drain if the beta of the second transistor Q2, is higher than that of the first Q1. If the transistors have the same beta the capacitor is connected direct to the drain. If the arrangement is to operate at D.C. then the capacitor is replaced by a D.C. biasing source. Esu supplies a bias on the substrate of the transistors. A dual gate MOST may be used, Fig. 6, providing effectively a series combination of F.E.T.s with a potentiometer R1, R2, providing a portion of the gate voltage Vg 1 to the gate g 2 to compensate the different beta's inherent in the MOST construction. The circuit may be used in variable attenuators, balanced modulators, or frequency doublers, no details being shown.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB471668 | 1968-01-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1251671A true GB1251671A (en) | 1971-10-27 |
Family
ID=9782452
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1251671D Expired GB1251671A (en) | 1968-01-30 | 1968-01-30 |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1251671A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2307398A1 (en) * | 1975-04-08 | 1976-11-05 | Int Standard Electric Corp | ADJUSTABLE ELECTRONIC RESISTANCE |
| FR2331198A1 (en) * | 1975-11-05 | 1977-06-03 | Int Standard Electric Corp | Electronically controlled resistor for control circuits - has selectively connectable FETs whose source voltage is used for control |
| FR2518849A1 (en) * | 1981-12-17 | 1983-06-24 | Western Electric Co | GAIN CONTROL AMPLIFIER |
| FR2539932A1 (en) * | 1983-01-21 | 1984-07-27 | Thomson Csf | DEVICE FOR COMPENSATING THE TEMPERATURE GAIN DERIVATIVES OF A MICROWAVE ELECTRICAL SIGNAL AMPLIFIER |
-
1968
- 1968-01-30 GB GB1251671D patent/GB1251671A/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2307398A1 (en) * | 1975-04-08 | 1976-11-05 | Int Standard Electric Corp | ADJUSTABLE ELECTRONIC RESISTANCE |
| FR2331198A1 (en) * | 1975-11-05 | 1977-06-03 | Int Standard Electric Corp | Electronically controlled resistor for control circuits - has selectively connectable FETs whose source voltage is used for control |
| FR2518849A1 (en) * | 1981-12-17 | 1983-06-24 | Western Electric Co | GAIN CONTROL AMPLIFIER |
| FR2539932A1 (en) * | 1983-01-21 | 1984-07-27 | Thomson Csf | DEVICE FOR COMPENSATING THE TEMPERATURE GAIN DERIVATIVES OF A MICROWAVE ELECTRICAL SIGNAL AMPLIFIER |
| EP0116492A1 (en) * | 1983-01-21 | 1984-08-22 | Thomson-Csf | Compensation device of the gain deviation with temperature of a hyperfrequency signal amplifier |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |