Temperature compensator for a crystal oscillator
阅读：932发布：2021-08-19
专利汇可以提供Temperature compensator for a crystal oscillator专利检索，专利查询，专利分析的服务。并且Crystal oscillators have been provided with a negative temperature characteristic capacitor to improve the frequency stability of the oscillator in the middle range of temperature, and have been provided with a voltage sensitive capacitor to improve the frequency stability of the oscillator in the cold and hot ranges of temperature. A temperature compensator is provided for varying the voltage applied to the voltage sensitive capacitor as a function of temperature. The temperature compensator has a middle temperature range circuit, a cold temperature range circuit, and a hot temperature range circuit which can stabilize the oscillator frequency to within plus or minus two parts per million ( + OR - 2 ppm) over a temperature range between -40* C and +85* C.，下面是Temperature compensator for a crystal oscillator专利的具体信息内容。
1. An improved temperature compensator for use with a crystal oscillator operating in a cold range, a middle range, and a hot range of temperature, said oscillator having at least one middle range negative temperature characteristic capacitor, and having at least one voltage sensitive capacitor, said improved temperature compensator comprising: a. first and second source terminals adapted to be connected to a source of direct current; b. first and second output terminals adapted to be connected to the voltage sensitive capacitor in an oscillator; c. means connecting said second source terminal to said second output terminal; d. a middle range temperature compensating circuit comprising: 1. first and second substantially equal resistors connected in series between said first and second source terminals; 2. means connecting the junction of said first and second resistors to said first output terminal; e. a cold range termperature compensating circuit comprising: 1. a first transistor having an emitter, a base, and a collector; 2. a first resistor having an inverse resistor-temperature characteristic; 3. means connecting the emitter-collector path of said first transistor and said first resistor in series between said first and second source terminals; 4. means connected from said first and second source terminals to said base of said first transistor for applying a selected bias voltage thereto; 5. a second transistor having an emitter, a base, and a collector; 6. a second resistor; 7. means connecting said second resistor and the emittercollector path of said second transistor in series between said first source terminal and said first output terminal; 8. means connecting said base of said second transistor to the junction of said emitter-collector path of said first transistor and said first resistor; 9. means connected to the junction of said second resistor and said emitter-collector path of said second transistor for deriving a first blocking signal from said cold range termperature compensating circuit; f. a hot range temperature compensating circuit comprising: 1 a third resistor having inverse resistor-temperature characteristics; 2. means connecting said third resistor in series between said fiRst and second source terminals; 3. a fourth transistor having an emitter, a base, and a collector; 4. a fourth resistor; 5. means connecting the emitter-collector path of said fourth transistor and said fourth resistor in series between said first output terminal and said second source terminal; 6. means connecting said base of said fourth transistor to said third resistor; 7. means connected to the junction of said fourth transistor and said fourth resistor for deriving a second blocking signal from said hot range temperature compensating circuit; g. means for connecting said cold range temperature deriving means to said base of said fourth transistor for applying said first blocking signal thereto; h. and means for connecting said hot range temperature deriving means to said base of said second transistor for applying said second blocking signal thereto.
2. means connecting the junction of said first and second resistors to said first output terminal; e. a cold range termperature compensating circuit comprising:
2. a first resistor having an inverse resistor-temperature characteristic;
2. means connecting said third resistor in series between said fiRst and second source terminals;
2. The improved temperature compensator of claim 1 and further comprising a fifth resistor having an inverse resistor-temperature characteristic, and means connecting said fifth resistor in series with said emitter-collector path of said first transistor and said first resistor.
3. a fourth transistor having an emitter, a base, and a collector;
3. means connecting the emitter-collector path of said first transistor and said first resistor in series between said first and second source terminals;
4. means connected from said first and second source terminals to said base of said first transistor for applying a selected bias voltage thereto;
4. a fourth resistor;
5. means connecting the emitter-collector path of said fourth transistor and said fourth resistor in series between said first output terminal and said second source terminal;
5. a second transistor having an emitter, a base, and a collector;
6. a second resistor;
6. means connecting said base of said fourth transistor to said third resistor;
7. means connected to the junction of said fourth transistor and said fourth resistor for deriving a second blocking signal from said hot range temperature compensating circuit; g. means for connecting said cold range temperature deriving means to said base of said fourth transistor for applying said first blocking signal thereto; h. and means for connecting said hot range temperature deriving means to said base of said second transistor for applying said second blocking signal thereto.
7. means connecting said second resistor and the emitter-collector path of said second transistor in series between said first source terminal and said first output terminal;
8. means connecting said base of said second transistor to the junction of said emitter-collector path of said first transistor and said first resistor;
9. means connected to the junction of said second resistor and said emitter-collector path of said second transistor for deriving a first blocking signal from said cold range termperature compensating circuit; f. a hot range temperature compensating circuit comprising: 1 a third resistor having inverse resistor-temperature characteristics;
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