Abstract: Circuitry generates base-to-emitter voltages (Vbe1, Vbe2) of two BJTs biased at different current densities, a base-to-emitter voltage (Vbe) of a BJT biased so Vbe is complementary to absolute temperature and has a curved non-linearity across temperature, and base-to-emitter voltages (Vbe1_c, Vbe2_c) of two BJTs biased by a temperature independent constant current and a current proportional to absolute temperature so Vbe2_c?Vbe1_c has the same but opposite curved non-linearity across temperature as Vbe. A sampling circuit samples these voltages and provides them to inputs of a loop filter. Filter outputs are quantized to produce a bitstream.

Abstract: A temperature sensing circuit a switched capacitor circuit selectively samples ?Vbe and Vbe voltages and provides the sampled voltages to inputs of an integrator. A quantization circuit quantizes outputs of the integrator to produce a bitstream. When a most recent bit of the bitstream is a logic zero, operation includes sampling and integration of ?Vbe a first given number of times to produce a voltage proportional to absolute temperature. When the most recent bit of the bitstream is a logic one, operation includes cause sampling and integration of Vbe a second given number of times to produce a voltage complementary to absolute temperature. A low pass filter and decimator filters and decimates the bitstream produced by the quantization circuit to produce a signal indicative of a temperature of a chip into which the temperature sensing circuit is placed.

Abstract: A reference current generator circuit generating a reference current that is proportional to absolute temperature as a function of a difference between bias voltages of first and second transistors. A voltage generator generates an input voltage from the reference current by applying the reference current that is proportional to absolute temperature through a plurality of transistors coupled in series between the bias voltage of the second transistor and ground, with the input voltage being generated at a node between given adjacent ones of the plurality of transistors. The input voltage is complementary to absolute temperature. A differential amplifier is biased by a current derived from the reference current and generates a temperature insensitive output reference voltage from the input voltage and a voltage proportional to absolute temperature.

Abstract: A temperature sensing circuit a switched capacitor circuit selectively samples ?Vbe and Vbe voltages and provides the sampled voltages to inputs of an integrator. A quantization circuit quantizes outputs of the integrator to produce a bitstream. When a most recent bit of the bitstream is a logic zero, operation includes sampling and integration of ?Vbe a first given number of times to produce a voltage proportional to absolute temperature. When the most recent bit of the bitstream is a logic one, operation includes cause sampling and integration of Vbe a second given number of times to produce a voltage complementary to absolute temperature. A low pass filter and decimator filters and decimates the bitstream produced by the quantization circuit to produce a signal indicative of a temperature of a chip into which the temperature sensing circuit is placed.

Abstract: A reference current generator circuit generating a reference current that is proportional to absolute temperature as a function of a difference between bias voltages of first and second transistors. A voltage generator generates an input voltage from the reference current by applying the reference current that is proportional to absolute temperature through a plurality of transistors coupled in series between the bias voltage of the second transistor and ground, with the input voltage being generated at a node between given adjacent ones of the plurality of transistors. The input voltage is complementary to absolute temperature. A differential amplifier is biased by a current derived from the reference current and generates a temperature insensitive output reference voltage from the input voltage and a voltage proportional to absolute temperature.

Abstract: A sub-bandgap reference voltage generator includes a reference current generator generating a reference current (proportional to absolute temperature), a voltage generator generating an input voltage (proportional to absolute temperature) from the reference current, and a differential amplifier. The differential amplifier is biased by the reference current and has an input receiving the input voltage and a resistor generating a voltage proportional to absolute temperature summed with the input voltage to produce a temperature insensitive output reference voltage. The reference current generator may generate the reference current as a function of a difference between bias voltages of first and second transistors.

Abstract: Circuitry generates base-to-emitter voltages (Vbe1, Vbe2) of two BJTs biased at different current densities, a base-to-emitter voltage (Vbe) of a BJT biased so Vbe is complementary to absolute temperature and has a curved non-linearity across temperature, and base-to-emitter voltages (Vbe1_c, Vbe2_c) of two BJTs biased by a temperature independent constant current and a current proportional to absolute temperature so Vbe2_c?Vbe1_c has the same but opposite curved non-linearity across temperature as Vbe. A sampling circuit samples these voltages and provides them to inputs of a loop filter. Filter outputs are quantized to produce a bitstream.

Abstract: A sub-bandgap reference voltage generator includes a reference current generator generating a reference current (proportional to absolute temperature), a voltage generator generating an input voltage (proportional to absolute temperature) from the reference current, and a differential amplifier. The differential amplifier is biased by the reference current and has an input receiving the input voltage and a resistor generating a voltage proportional to absolute temperature summed with the input voltage to produce a temperature insensitive output reference voltage. The reference current generator may generate the reference current as a function of a difference between bias voltages of first and second transistors.

Abstract: A first signal received at a first transistor is compared to a second signal received at a second transistor taking into account a hysteresis value to generate a comparison output. At least one of the first and second transistors has a floating bulk. A switching circuit selectively applies first and second bulk bias voltages to the floating bulk of the first or second transistor in dependence on the comparison output. A third and fourth input signals, setting the hysteresis value, are received at third and fourth transistors and compared to generate differential outputs. At least one of the third and fourth transistors has a floating bulk. A differential amplifier determines a difference between the differential outputs for application to the floating bulk of the at least one of the third and fourth transistor and further for use as one of the first and second bulk bias voltages.

Abstract: A first signal received at a first transistor is compared to a second signal received at a second transistor taking into account a hysteresis value to generate a comparison output. At least one of the first and second transistors has a floating bulk. A switching circuit selectively applies first and second bulk bias voltages to the floating bulk of the first or second transistor in dependence on the comparison output. A third and fourth input signals, setting the hysteresis value, are received at third and fourth transistors and compared to generate differential outputs. At least one of the third and fourth transistors has a floating bulk. A differential amplifier determines a difference between the differential outputs for application to the floating bulk of the at least one of the third and fourth transistor and further for use as one of the first and second bulk bias voltages.