GB1167366A - Oscillation Generator Embodying Differential Amplifier Pairs - Google Patents
Oscillation Generator Embodying Differential Amplifier PairsInfo
- Publication number
- GB1167366A GB1167366A GB4893266A GB4893266A GB1167366A GB 1167366 A GB1167366 A GB 1167366A GB 4893266 A GB4893266 A GB 4893266A GB 4893266 A GB4893266 A GB 4893266A GB 1167366 A GB1167366 A GB 1167366A
- Authority
- GB
- United Kingdom
- Prior art keywords
- resistance
- edge
- circuit
- thermistor
- transistors
- 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
- 230000010355 oscillation Effects 0.000 title 1
- 239000003990 capacitor Substances 0.000 abstract 2
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 238000005259 measurement Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/023—Generators characterised by the type of circuit or by the means used for producing pulses by the use of differential amplifiers or comparators, with internal or external positive feedback
- H03K3/0231—Astable circuits
Landscapes
- Oscillators With Electromechanical Resonators (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
1,167,366. Measuring temperature electrically; resistance measurement. E.G. & G. INTERNATIONAL Inc. Nov.1, 1966, No.48932/66. Headings G1N and G1U. [Also in Division H3] An oscillator suitable for use in determining the resistance of a thermistor and thus its ambient temperature comprises two differential switching pairs, shown as transistors Q1, Q2 and Q1', Q2', having the output Q1, Q2 connected to the input of Q1', Q2' and with an R, C circuit coupling the output terminals of Q'1, Q'2 to one input Q1 of Q1, Q2. The resistance is switchable between two valves e.g. that of a thermistor TH and a reference resistance TH, to vary the frequency so that the frequency change represents the difference of resistance and this the difference of temperature. In operation, when Q1 becomes conducting a positive edge is applied through C to the line of Q1 (see edge I) to switch over the circuit. The capacitor C then discharges through TH or REF (see waveform portion II) until the voltage is such that Q1 is rendered non-conductive. The states of the transistors therefore reverse producing edge I' and discharge slope II. Thus the circuit oscillates. The capacitor and resistors are regarded as providing positive and negative feedback. A reference level is applied to the base of Q2 equal to the mean of the collector voltages of Q1' and Q2'.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4893266A GB1167366A (en) | 1966-11-01 | 1966-11-01 | Oscillation Generator Embodying Differential Amplifier Pairs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4893266A GB1167366A (en) | 1966-11-01 | 1966-11-01 | Oscillation Generator Embodying Differential Amplifier Pairs |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1167366A true GB1167366A (en) | 1969-10-15 |
Family
ID=10450493
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4893266A Expired GB1167366A (en) | 1966-11-01 | 1966-11-01 | Oscillation Generator Embodying Differential Amplifier Pairs |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1167366A (en) |
-
1966
- 1966-11-01 GB GB4893266A patent/GB1167366A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |