JPS57103413A - Microwave discriminator - Google Patents
Microwave discriminatorInfo
- Publication number
- JPS57103413A JPS57103413A JP17957280A JP17957280A JPS57103413A JP S57103413 A JPS57103413 A JP S57103413A JP 17957280 A JP17957280 A JP 17957280A JP 17957280 A JP17957280 A JP 17957280A JP S57103413 A JPS57103413 A JP S57103413A
- Authority
- JP
- Japan
- Prior art keywords
- drain
- frequency
- phase
- gate
- changed
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
- H03D3/02—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal
- H03D3/22—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by means of active elements with more than two electrodes to which two signals are applied derived from the signal to be demodulated and having a phase difference related to the frequency deviation, e.g. phase detector
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Abstract
PURPOSE:To make the constitution simple and to enhance the demodulation sensitivity, by detecting the phase by utilizing the fact that the impedance between the drain and the source of an FET is much changed when the DC bias voltage of the gate of the FET is changed. CONSTITUTION:A gate bias voltage is so adjusted that the impedance between the drain and the source of an FET2 is conformed with the characteristic impedance of a band-pass filter 4. The length of a transmission line 5 is set to such value that the phase is shifted by pi/4 in a local signal frequency. The length of a transmission line 6 is set to such value that the phase of the signal passing through this line 6 is shifted from the signal, which is applied to a drain D of the FET2 through the band-pass filter 4 and the transmission line 5 in the local signal frequency by pi/2. The center frequency of the band-pass filter 4 is the frequency of the local signal. Therefore, since local frequency signals applied to the drain D and a gate G of the FET have pi/2 phase difference, the DC output is zero at this point. When the frequency is changed to deviate the phase difference between signals applied to the drain D and the gate G from pi/2, the DC voltage is changed, and the DC voltage is maximum when they are in the same phase.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17957280A JPS57103413A (en) | 1980-12-18 | 1980-12-18 | Microwave discriminator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17957280A JPS57103413A (en) | 1980-12-18 | 1980-12-18 | Microwave discriminator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57103413A true JPS57103413A (en) | 1982-06-28 |
| JPS6329843B2 JPS6329843B2 (en) | 1988-06-15 |
Family
ID=16068078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17957280A Granted JPS57103413A (en) | 1980-12-18 | 1980-12-18 | Microwave discriminator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57103413A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03159022A (en) * | 1989-11-16 | 1991-07-09 | Samsung Electron Devices Co Ltd | Direct heated cathode structure and manufacture thereof |
-
1980
- 1980-12-18 JP JP17957280A patent/JPS57103413A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6329843B2 (en) | 1988-06-15 |
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