# US 4,400,796 A · Temperature compensated sense amplifier > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,400,796 A - Document ID: US4400796A - Status: Granted - Kind: A - Application number: 06/218,995 - Filed: 1980-12-22 - Granted: 1983-08-23 - Earliest claimed: 1979-11-05 - Assignees: Texas Instruments Incorporated - Inventors: Thomas A. Closson; David B. Oxford; Stephen R. Schenck; Jerold A. Seitchik - Web page: https://patentgrep.com/patent/US4400796A ## CPC - H03K 5/02: by amplifying (H03K5/04 takes precedence) - G11C 19/0866: {Detecting magnetic domains} - H03K: PULSE TECHNIQUE (measuring pulse characteristics G01R; modulating sinusoidal oscillations with pulses H03C; transmission of digital information H04L; discriminator circuits detecting phase difference between two signals by counting or integrating cycles of oscillation H03D3/04; automatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses where the type of generator is irrelevant or unspecified H03L; coding, decoding or code conversion, in general H03M) - G11C: STATIC STORES (semiconductor memory devices H10B) ## Abstract A temperature compensated, phase tolerant sense amplifier for use in a magnetic bubble memory system in which current is applied to the detector resistors only during a bubble detect operation. ## Claims ### Claim 1 A sense amplifier for providing a trigger signal output, said sense amplifier comprising: current source means for providing a flow of current at a level determined by a reference voltage through each of first and second conductors to develop respective voltages therefor; amplifier means having first and second inputs connected to said current source means via said first and second conductors for providing an intermediate output signal proportionally greater than the differential signal developed between said first and second inputs from the respective voltages of said first and second conductors; comparator means connected to the output of said amplifier means for providing the trigger signal output in response to the intermediate output signal from said amplifier means exceeding a predetermined threshold voltage; and temperature compensation means connected to said current source means for providing the reference voltage thereto at a voltage magnitude determined by the temperature sensed by said temperature compensation means. ### Claim 2 (depends on 1) A sense amplifier as set forth in claim 1, wherein said temperature compensation means is connected to said amplifier means for establishing the gain of said amplifier means at a level determined by the temperature sensed by said temperature compensation means. ### Claim 3 (depends on 1) A sense amplifier as set forth in claim 1, wherein said temperature compensation means is connected to said comparator means for providing the threshold voltage for said comparator means at a voltage magnitude determined by the temperature sensed by said temperature compensation means. ### Claim 4 (depends on 3) A sense amplifier as set forth in claim 3, wherein said temperature compensation means is also connected to said amplifier means for establishing the gain of said amplifier means at a level determined by the temperature sensed by said temperature compensation means. ### Claim 5 A sense amplifier for providing a trigger signal output, said sense amplifier comprising: current source means for providing a flow of current at a level determined by a reference voltage through each of first and second conductors to develop respective voltages therefor; amplifier means having first and second inputs connected to said current source means via said first and second conductors for providing an intermediate output signal proportionally greater than the differential signal developed between said first and second inputs from the respective voltages of said first and second conductors; comparator means connected to the output of said amplifier means for providing the trigger signal output in response to the intermediate output signal from said amplifier means exceeding a predetermined threshold voltage; and temperature compensation means connected to said amplifier means for establishing the gain of said amplifier means at a level determined by the temperature sensed by said temperature compensation means. ### Claim 6 (depends on 5) A sense amplifier as set forth in claim 5, wherein said temperature compensation means is connected to said comparator means for providing the threshold voltage for said comparator means at a voltage magnitude determined by the temperature sensed by said temperature compensation means. ### Claim 7 A sense amplifier for providing a trigger signal output, said sense amplifier comprising: current source means for providing a flow of current at a level determined by a reference voltage through each of first and second conductors to develop respective voltages therefor; amplifier means having first and second inputs connected to said current source means via said first and second conductors for providing an intermediate output signal proportionally greater than the differential signal developed between said first and second inputs from the respective voltages of said first and second conductors; comparator means connected to the output of said amplifier means for providing the trigger signal output in response to the intermediate output signal from said amplifier means exceeding a predetermined threshold voltage; and temperature compensation means connected to said comparator means for providing the threshold voltage for said comparator means at a voltage magnitude determined by the temperature sensed by said temperature compensation means. ### Claim 8 (depends on 1, 5) A sense amplifier as set forth in any of claims 1, 5, and 7, wherein the temperature sensed by said temperature compensation means is the temperature of said temperature compensation means itself.