US3899746A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two oscillators alternately switched into a phase lock loop with outputs taken only during free running period of each oscillator
Assignee: Siemens AG
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Filing: 1973-09-14
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Granted: 1975-08-12
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Expires: 1993-09-14
Abstract
Abstract A stabilized oscillator circuit having two controlled oscillator stages with switching means for periodically switching from the output of one oscillator stage to the output of the other oscillator stage. Each of the controlled oscillator stages are stable within predetermined limits for a given period when freerunning and stabilized from a reference oscillator circuit for a terminal part of the time that the other controlled oscillator is effective. Stabilization is effected by a phase discriminator which compares the output of the reference oscillator with a reduced component of the output from the controlled oscillator stage. The arrangement may also employ individual oscillator stages operated at the same operating frequency. This makes it possible to generate an oscillation practically free of subsidiary waves, even over a long period of time. As the term ''''subsidiary waves'''' is herein used, it does not refer to multiples or harmonics of the oscillating frequency, but rather to interfering frequency components which result from the frequency preparation process during stabilization and control setting.
Inventors
- 👤 Josef Engelbert Gammel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:10
CPC Classifications
H; H03; H03L; H03L7/00; H03L7/06; H03L7/16; H03L7/18; H03L7/183; H03L7/08; H03L7/14; H03L7/141; H03L7/197; H03L7/199
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
165 words
A stabilized oscillator circuit comprising two controlled oscillator stages, an output terminal, first switching means for periodically switching said output terminal from the output of one oscillator stage to the output of the other, each of said controlled oscillator stages being stable within predetermined limits for a given period when free running, a reference oscillator circuit, an adjustable frequency divider network, a phase discriminator having a first input connected to said reference oscillator, and having a second input connected to an output of said frequency divider network, second switching means for selectively connecting alternately one of said controlled oscillator stages into a loop between an output of said phase discriminator and an input of said frequency divider network, said first and second switching means being alternately operative to connect the output of one of said controlled oscillator stages while it is free-running to said output terminal and to connect the other controlled oscillator stage into said loop to be stabilized by said reference frequency oscillator.
Claim 2
Dependent Claim
165 words
A stabilized oscillator circuit comprising two controlled oscillator stages, an output terminal, first switching means for periodically switching said output terminal from the output of one oscillator stage to the output of the other, each of said controlled oscillator stages being stable within predetermined limits for a given period when free running, a reference oscillator circuit, an adjustable frequency divider network, a phase discriminator having a first input connected to said reference oscillator, and having a second input connected to an output of said frequency divider network, second switching means for selectively connecting alternately one of said controlled oscillator stages into a loop between an output of said phase discriminator and an input of said frequency divider network, said first and second switching means being alternately operative to connect the output of one of said controlled oscillator stages while it is free-running to said output terminal and to connect the other controlled oscillator stage into said loop to be stabilized by said reference frequency oscillator.
Claim 3
Dependent Claim
54 words
A stabilized oscillator circuit according to claim 1, in which each of said controlled oscillator stages is a stage that possesses a high short-term frequency stability such that during the operating period its oscillating frequency is within a given tolerance range of its set frequency value for at least 10 msec of free-running operation.
Claim 4
Dependent Claim
58 words
A stabilized oscillator circuit according to claim 1, in which each said controlled oscillator stage is connected into said loop to effect any required frequency correction, and is disconnected therefrom before it has its output connected to said output terminal, so that it operates without the frequency stabilization circuit at least for a part of its active period.
Claim 5
Dependent Claim
19 words
A stabilized oscillator circuit according to claim 1, in which said reference oscillator circuit comprises a crystal controlled oscillator.
Claim 6
Dependent Claim
179 words
A stabilized oscillator circuit having an output terminal and comprising two controlled oscillator stages, switching means for periodically connecting an output of first one and then the other of said controlled oscillator stages to said output terminal, each of said controlled oscillator stages being stable within predetermined limits for a given period when free-running, a reference oscillator circuit, means for stabilizing said other one of said controlled oscillator stages from said reference oscillator circuit for a terminal part of the time that said one of said controlled oscillator stages is connected to said output terminal, means for stabilizing said one of said controlled oscillator stages from said reference oscillator circuit for a terminal part of the time that said other one of said controlled oscillator stage is connected to said output terminal, said stabilizing means including a phase discriminator for comparing the output frequency of the reference oscillator with a frequency component of the output of a respective one of said controlled oscillator stages and for providing a control signal to said respective one of said controlled oscillator stages.
Claim 7
Dependent Claim
179 words
A stabilized oscillator circuit having an output terminal and comprising two controlled oscillator stages, switching means for periodically connecting an output of first one and then the other of said controlled oscillator stages to said output terminal, each of said controlled oscillator stages being stable within predetermined limits for a given period when free-running, a reference oscillator circuit, means for stabilizing said other one of said controlled oscillator stages from said reference oscillator circuit for a terminal part of the time that said one of said controlled oscillator stages is connected to said output terminal, means for stabilizing said one of said controlled oscillator stages from said reference oscillator circuit for a terminal part of the time that said other one of said controlled oscillator stage is connected to said output terminal, said stabilizing means including a phase discriminator for comparing the output frequency of the reference oscillator with a frequency component of the output of a respective one of said controlled oscillator stages and for providing a control signal to said respective one of said controlled oscillator stages.
Claim 8
Dependent Claim
85 words
A stabilized oscillator circuit comprising two control oscillators, switching means for alternately switching said control oscillators into a phase lock loop, an output terminal, means for alternately connecting said control oscillators to said output terminal during a free-running period of each oscillator, said phase lock loop including a reference oscillator and means for comparing the reference oscillator frequency with the frequency of one of said control oscillators, each said control oscillator being free-running during the period when such oscillator is connected to the output terminal.
Claim 9
Dependent Claim
85 words
A stabilized oscillator circuit comprising two control oscillators, switching means for alternately switching said control oscillators into a phase lock loop, an output terminal, means for alternately connecting said control oscillators to said output terminal during a free-running period of each oscillator, said phase lock loop including a reference oscillator and means for comparing the reference oscillator frequency with the frequency of one of said control oscillators, each said control oscillator being free-running during the period when such oscillator is connected to the output terminal.
Claim 10
Dependent Claim
191 words
A stabilized oscillator circuit comprising two controllable oscillator stages operating at the same frequency, an output circuit, A reference oscillator having a stabilized reference frequency, a frequency divider circuit, switch means for alternately connecting an output of first one and then the other of said controllable oscillator stages to said output circuit and for alternately connecting an output of first said other and then said one ofsaid controllable oscillator stages to said frequency divider circuit, a phase discriminator circuit to which said reference oscillator and said frequency divider circuit are connected, means to stabilize each said controllable oscillator stage from the output of said phase discriminator during the time that said controllable oscillator stage is connected to said frequency divider circuit, said switching means which connects first one and then the other of said controllable oscillator stages to said output circuit being such as to cause a transition from one controllable oscillator stage to the other to take place so slowly that any interference phase modulation produced by the transition process remains below a predetermined value, both controllable oscillator stages being disconnected from the phase discriminator circuit during the transition period.
Claim 11
Dependent Claim
191 words
A stabilized oscillator circuit comprising two controllable oscillator stages operating at the same frequency, an output circuit, A reference oscillator having a stabilized reference frequency, a frequency divider circuit, switch means for alternately connecting an output of first one and then the other of said controllable oscillator stages to said output circuit and for alternately connecting an output of first said other and then said one ofsaid controllable oscillator stages to said frequency divider circuit, a phase discriminator circuit to which said reference oscillator and said frequency divider circuit are connected, means to stabilize each said controllable oscillator stage from the output of said phase discriminator during the time that said controllable oscillator stage is connected to said frequency divider circuit, said switching means which connects first one and then the other of said controllable oscillator stages to said output circuit being such as to cause a transition from one controllable oscillator stage to the other to take place so slowly that any interference phase modulation produced by the transition process remains below a predetermined value, both controllable oscillator stages being disconnected from the phase discriminator circuit during the transition period.
References Cited (Backward Citations)
US3348164A
Cited
US3729688A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |