Monolithic optical autocompensation read-out circuit for precise reflection measurements of distances
First Claim
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1. A circuit, capable of detecting and sensing photons under consideration of side effects such as temperature changes, drift, aging and ambient light influences thus generating an appropriately corrected output signal of the circuit, and having an optical input facility and an output terminal as well as terminals for supply voltages and ground connections, comprising:
- two sets of a basic photo sensitive circuit being operated in parallel to each other, one set in light mode and the other in dark mode;
each set comprising;
a photo diode connected to both the gate input of a field effect transistor and to one contact of a switching device;
said switching device also connected to said supply voltage;
said field effect transistor connected with its drain input to said supply voltage and connected with its source input to both a current source and an amplifier input;
said current source also connected to ground; and
a common differential amplifier used commonly for both sets thus having two of said amplifier inputs and outputs;
witha common control circuit for the processing of the signals delivered from said outputs of said operational amplifier, thus generating said appropriately corrected output signal of the circuit.
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Abstract
A circuit and method are given, to realize a loudness control for mobile phone earpieces and speakers with the help of a proximity sensor, which is realized as an infrared photo-electric guard circuit, where only very few external parts are needed. As a novelty here, the necessary photo sensors are integrated onto a single chip. To form the photodiodes within a single IC together with the other circuit elements are much less expensive. Using the advantages of that solution the circuit of the invention is manufactured with standard CMOS technology and only very few discrete external components. This solution reduces also power consumption and manufacturing cost.
50 Citations
24 Claims
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1. A circuit, capable of detecting and sensing photons under consideration of side effects such as temperature changes, drift, aging and ambient light influences thus generating an appropriately corrected output signal of the circuit, and having an optical input facility and an output terminal as well as terminals for supply voltages and ground connections, comprising:
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two sets of a basic photo sensitive circuit being operated in parallel to each other, one set in light mode and the other in dark mode;
each set comprising;a photo diode connected to both the gate input of a field effect transistor and to one contact of a switching device; said switching device also connected to said supply voltage; said field effect transistor connected with its drain input to said supply voltage and connected with its source input to both a current source and an amplifier input; said current source also connected to ground; and a common differential amplifier used commonly for both sets thus having two of said amplifier inputs and outputs;
witha common control circuit for the processing of the signals delivered from said outputs of said operational amplifier, thus generating said appropriately corrected output signal of the circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A circuit manufactured as an integrated circuit formed on a single chip, capable of detecting and sensing photons under consideration of side effects such as temperature changes, drift, aging and ambient light influences thus generating an appropriately corrected output signal of the circuit, and having an optical input facility and an output terminal as well as terminals for supply voltages and ground connections, comprising:
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two sets of a basic photo sensitive circuit being operated in parallel to each other, one set in light mode and the other in dark mode;
each set comprising;a photo diode connected to both the gate input of a field effect transistor and to one contact of a switching device; said switching device also connected to said supply voltage; said field effect transistor connected with its drain input to said supply voltage and connected with its source input to both a current source and an amplifier input; said current source also connected to ground; and a common differential amplifier used commonly for both sets thus having two of said amplifier inputs and outputs;
witha common control circuit for the processing of the signals delivered from said outputs of said operational amplifier, thus generating said appropriately corrected output signal of the circuit. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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Specification
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Current AssigneeDialog Semiconductor GmbH (Renesas Electronics Corporation)
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Original AssigneeDialog Semiconductor GmbH (Renesas Electronics Corporation)
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InventorsKnoedgen, Horst
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Primary Examiner(s)Jackson, Blane J
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Application NumberUS11/893,818Publication NumberTime in Patent Office586 DaysField of Search250/208.1, 250/214.A, 250/214.R, 250/214.P, 250/214.D, 250/214.DC, 250/214.1, 250/216, 330/59, 330/307, 330/308, 330/277, 330/3, 330/7, 398/202, 455/323, 455/333, 455/334, 455/341US Class Current455/334CPC Class CodesG01J 1/44 Electric circuits for comma...H04M 1/605 involving control of the re...H04M 2250/12 including a sensor for meas...Y02D 30/70 in wireless communication n...
