4 results about "Switched capacitor integrator" patented technology

The application provides a high-resolution two-step ADC for temperature sensing and an electronic device, and relates to the technical field of integrated circuits. A front-end buffer input end is coupled to a temperature-sensing front end; a switched capacitor integrator input end is coupled to an output end of the front-end buffer; a comparator input end is coupled to an output end of the switched capacitor integrator; a counter input end is coupled to an output end of the comparator; and a logic control unit input end is coupled to an output end of the comparator. The application proposes a structure of coarse quantization SDM+fine quantization SAR, without the need of additional high-speed counters, and the system power consumption and hardware complexity are reduced. By multiplexing the integration branch of the switched capacitor integrator, the comparator can not need to eliminate the offset voltage, further simplifying the comparator and the front-end buffer, and achieving the balance between high precision and low power consumption. The SDM can be high-speed running and has good noise performance for specific oversampling ratios, while realizing small chip integration size and low power consumption.

The application discloses a switched capacitor integrator, comprising a sampling capacitor, a dynamic amplifier, an integration capacitor and a common-mode feedback module; one end of the sampling capacitor receives an input signal through a switch assembly, and the other end of the sampling capacitor is connected with an input end of the dynamic amplifier and one end of the integration capacitor through the switch assembly; the other end of the integration capacitor is connected with an output end of the dynamic amplifier and one end of the common-mode feedback module; the other end of the common-mode feedback module is connected with a cascade output stage of the dynamic amplifier; the dynamic amplifier is used for amplifying a voltage signal collected by the sampling capacitor and outputting a common-mode voltage; the common-mode feedback module is used for generating a reference voltage and calibrating the common-mode voltage; and the integration capacitor is used for integrating operation on charges accumulated by the sampling capacitor and outputting a voltage signal proportional to the input signal.

The application discloses a kind of strong PUF circuits for Internet of Things security protection, including two TMR sensor arrays, two instrument amplifiers, two switched capacitor integrators and a comparator, TMR sensor array includes multiple TMR sensor units, the number of TMR sensor units in two TMR sensor arrays is controlled to be turned on by excitation signal, so that it generates differential voltage signal, two instrument amplifiers differentially amplify two differential voltage signals respectively, generate amplified voltage signal, two switched capacitor integrators are sampled and accumulated to amplified voltage signal respectively, and sample voltage signal is output to comparator, comparator carries out voltage polarity decision to two sample voltage signals, and obtains PUF response;The advantages are that it has higher uniqueness and randomness, and also has higher stability, lower bit error rate and higher excitation-response pair number, can meet the demand of high reliability large-scale security authentication system.