Invention Grant
US3916341A R-c feedback oscillator with plural frequency selecting switches producing output signal only when a single switch is closed
失效
具有多个频率选择开关的R-C反馈振荡器仅当单个开关闭合时才产生输出信号
- Patent Title: R-c feedback oscillator with plural frequency selecting switches producing output signal only when a single switch is closed
- Patent Title (中): 具有多个频率选择开关的R-C反馈振荡器仅当单个开关闭合时才产生输出信号
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Application No.: US39275373Application Date: 1973-08-29
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Publication No.: US3916341APublication Date: 1975-10-28
- Inventor: COOL HANS
- Applicant: PHILIPS CORP
- Assignee: Philips Corp
- Current Assignee: Philips Corp
- Priority: NL7212510 1972-09-15
- Main IPC: H04M1/76
- IPC: H04M1/76 ; H03B1/00 ; H03B5/24 ; H03B5/26 ; H04L27/26 ; H04M1/50 ; H04Q1/45 ; H04Q7/14 ; H03B3/04
Abstract:
An arrangement for generating signals for selection, in particular for use in telephone subscribers sets. The device comprises a switchable RC- oscillator which is composed of an amplifier with negative feedback and a frequency-dependent voltage divider for positive feedback which comprises resistors, capacitors and switches. The frequency-dependent voltage divider has a configuration such that, if one switch is closed, the attenuation is smaller than the amplification of the amplifier and, if two switches are closed, the attenuation is larger than the amplification.
Public/Granted literature
- USB392753I5 Public/Granted day:1975-01-28
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