CROSS-COUPLED COMPLEMENTARY TRANSISTOR CIRCUIT FOR SINGLE COIL ELECTRO-MECHANICAL OSCILLATOR
First Claim
1. A circuit arrangement for driving an electro-mechanical oscillator, said oscillator including a magnetic system and a single coil magnetically coupled thereto, a source of supply voltage, a driving transistor, a control transistor of complimentary conductivity type to that of said driving transistor, one end of said coil coupled to the collector of said driving transistor, the other end of said coil coupled to one pole of said source of supply voltage, the base of said control transistor being coupled to the collector of said driving transistor, the base of said driving transistor being coupled to the collector of said control transistor, the emitter of said driving transistor being coupled to the other pole of said source of supply voltage, a capacitor, the emitter of said control transistor being coupled to said one pole of said source of supply voltage via said capacitor, a first ohmic resistor, the emitter of said control transistor being DC coupled to said one end of said coil via said first ohmic resistor wherein the improvement comprises:
- a second ohmic resistor coupled between the collector of said driving transistor and said one end of said coil; and
an auxiliary transistor which is complimentary to the driving transistor, the base of said auxiliary transistor connected to the junction of said coil and said second resistor, the collector of said auxiliary transistor connected to said other pole of said source of supply voltage, the emitter of said auxiliary transistor being connected to the junction of said first ohmic resistor and said capacitor.
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Abstract
This is a circuit for driving an electro-mechanical oscillator having one coil and two complementary transistors. The emitter resistor of the control transistor is connected to that end of the coil not facing the supply voltage. The emitter capacitor of the control transistor is connected to the supply voltage. A resistor is connected between the coil and the collector of the driving transistor. An auxiliary transistor complementary to the driving transistor is provided so that the base is connected to the connecting point of the resistor and the coil.
1 Citation
2 Claims
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1. A circuit arrangement for driving an electro-mechanical oscillator, said oscillator including a magnetic system and a single coil magnetically coupled thereto, a source of supply voltage, a driving transistor, a control transistor of complimentary conductivity type to that of said driving transistor, one end of said coil coupled to the collector of said driving transistor, the other end of said coil coupled to one pole of said source of supply voltage, the base of said control transistor being coupled to the collector of said driving transistor, the base of said driving transistor being coupled to the collector of said control transistor, the emitter of said driving transistor being coupled to the other pole of said source of supply voltage, a capacitor, the emitter of said control transistor being coupled to said one pole of said source of supply voltage via said capacitor, a first ohmic resistor, the emitter of said control transistor being DC coupled to said one end of said coil via said first ohmic resistor wherein the improvement comprises:
- a second ohmic resistor coupled between the collector of said driving transistor and said one end of said coil; and
an auxiliary transistor which is complimentary to the driving transistor, the base of said auxiliary transistor connected to the junction of said coil and said second resistor, the collector of said auxiliary transistor connected to said other pole of said source of supply voltage, the emitter of said auxiliary transistor being connected to the junction of said first ohmic resistor and said capacitor.
- a second ohmic resistor coupled between the collector of said driving transistor and said one end of said coil; and
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2. A circuit arrangement according to claim 1, further comprising:
- a third resistor coupled between the junction of said capacitor and the emitter of said auxiliary transistor, and the emitter of said control transistor.
Specification
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- Resources
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Current AssigneeHans Keller, Wolfgang Sauer
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Original AssigneeHans Keller, Wolfgang Sauer
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InventorsKeller, Hans, Sauer, Wolfgang
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Primary Examiner(s)Lake, Roy
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Assistant Examiner(s)Grimm, Siegfried H.
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Application NumberUS05/227,369Time in Patent Office494 DaysField of Search331/116M 58/23A,23AC,28A 318/128,132US Class Current331/116.00MCPC Class CodesG04C 3/069 Driving circuits using a si...H03B 5/30 with frequency-determining ...
