Pyroelectric detector with feedback amplifier for enhanced low frequency response
First Claim
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1. A pyroelectric detector comprising:
- means for sensing infrared radiation;
means connected in parallel with said sensing means for providing a load to measure said sensing means output, wherein said load means comprises a first resistor in series with a second resistor;
means coupled to said output of said sensing means for buffering said output; and
said detector comprises a feedback means connected from an output to an input of said buffering means for producing multiplication of the resistance of said load.
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Abstract
A pyroelectric detector circuit comprises a pyroelectric sensor element connected to a load resistor and to an input of a buffer amplifier having a feedback path for multiplying the resistance of the load resistor at non-zero frequencies. This feedback enables the use of a smaller load resistor which is multiplied to produce a higher effective load resistance necessary for proper low frequency response of the detector circuit.
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Citations
20 Claims
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1. A pyroelectric detector comprising:
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means for sensing infrared radiation;
means connected in parallel with said sensing means for providing a load to measure said sensing means output, wherein said load means comprises a first resistor in series with a second resistor;
means coupled to said output of said sensing means for buffering said output; and
said detector comprises a feedback means connected from an output to an input of said buffering means for producing multiplication of the resistance of said load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A pyroelectric detector comprising:
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means for sensing infrared radiation;
means connected in parallel with said sensing means for providing a load to measure said sensing means output, said load comprising a first load resistor in series with a second resistor;
means connected to said output of said sensing means for buffering said sensing means output;
said detector comprises an output divider which includes a first source resistor connected in series with a second source resistor; and
said detector comprises a feedback means connected from the junction of said first source resistor and said second source resistor to the junction of said first load resistor and said second resistor for producing multiplication of said load. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method of providing a pyroelectric detector comprising the steps of:
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sensing infrared radiation;
connecting a load in parallel with means for sensing said infrared radiation, wherein said step of connecting said load comprises the step of connecting a first resistor in series with a second resistor;
buffering said output of said sensing means with amplifier means; and
providing a feedback means in said amplifier means for producing multiplication of the resistance of said load. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification