Comparison circuit and analog-to-digital conversion device

A comparison circuit comprising:

• an input circuit made up of a first transistor for receiving a first signal at the gate electrode, and a second transistor for receiving a second signal at the gate electrode;
• a first current route of which the electric current is controlled by the first transistor according to the voltage of the first signal;
• a second current route of which the electric current is controlled by the second transistor according to the voltage of the second signal;
• a latch circuit for amplifying potential difference between a first node within the first current route and a second node within the second current route;
• a comparative operation control circuit including a first switch for executing supply or blocking of supply of high potential VDD to the drain of the first transistor, a second switch for executing supply or blocking of supply of high potential VDD to the drain of the second transistor, a third switch for executing supply or blocking of supply of ground VSS to the first current route, and a fourth switch for executing supply or blocking of supply of ground VSS to the second current route;
• and
• a comparative operation setting circuit for independently controlling supply or blocking of supply of the first switch, the second switch, the third switch, and the fourth switch.

A comparison circuit comprises:

• an input circuit made up of a first transistor for receiving a first signal at the gate electrode, and a second transistor for receiving a second signal at the gate electrode;
• a first current route of which the electric current is controlled by the first transistor according to the voltage of the first signal;
• a second current route of which the electric current is controlled by the second transistor according to the voltage of the second signal;
• a latch circuit for amplifying potential difference between a first node within the first current route and a second node within the second current route;
• a comparative operation control circuit including a first switch for executing supply or blocking of supply of ground potential to the drain of the first transistor, a second switch for executing supply or blocking of supply of ground potential to the drain of the second transistor, a third switch for executing supply or blocking of supply of high potential to the first current route, and a fourth switch for executing supply or blocking of supply of high potential to the second current route;
• and
• a comparative operation setting circuit for independently controlling supply or blocking of supply of the first switch, the second switch, the third switch, and the fourth switch.

An analog-to-digital conversion device comprising:

• a comparator including an input circuit for receiving a complementary input signal to generate an inversion complementary signal having the inversion logic of the complementary input signal, and a latch circuit for latching the inversion complementary signal;
• a comparative operation control circuit including a first switch for connecting or disconnecting the latch circuit and the input circuit to or from a high-potential power source according to the logic of a first signal, and a second switch for connecting or disconnecting the latch circuit and the input circuit to or from a high-potential power source according to the logic of a second signal;
• a delay circuit for outputting the first signal and the second signal;
• a successive operation control circuit for outputting a control signal for controlling the period of logic change of the first signal for controlling disconnection of the first switch, and the period of logic change of the second signal for controlling disconnection of the second switch, based on the logic of a signal latched by the latch circuit.

An analog-to-digital conversion device comprising:

• a comparator including an input circuit for receiving a complementary input signal to generate an inversion complementary signal having the inversion logic of the complementary input signal, and a latch circuit for latching the inversion complementary signal;
• a comparative operation control circuit including a plurality of first switches for connecting or disconnecting the latch circuit and the input circuit to or from a high-potential power source according to the logic of each of a plurality of first signals, and a plurality of second switches for connecting or disconnecting the latch circuit and the input circuit to or from a high-potential power source according to the logic of each of a plurality of second signals;
• a delay circuit for outputting each of the first signals and each of the second signals;
• a successive operation control circuit for outputting a control signal for controlling the period of logic change of each of the first signals for controlling disconnection of each of the plurality of first switches, and the period of logic change of each of the second signals for controlling disconnection of each of the plurality of second switches, based on the logic of a signal latched by the latch circuit.

An analog-to-digital conversion device comprising:

• a comparator including an input circuit for receiving a complementary input signal to generate an inversion complementary signal having the inversion logic of the complementary input signal, and a latch circuit for latching the inversion complementary signal;
• a comparative operation control circuit including a first switch for connecting or disconnecting the latch circuit and the input circuit to or from a high-potential power source according to the logic of a first signal, and a second switch for connecting or disconnecting the latch circuit and the input circuit to or from a high-potential power source according to the logic of a second signal;
• a delay circuit including a first inverter for outputting the first signal, and a second inverter for outputting the second signal;
• a successive operation control circuit for outputting a control signal for controlling the period of logic change of the first signal for controlling disconnection of the first switch, and the period of logic change of the second signal for controlling disconnection of the second switch, based on the logic of a signal latched by the latch circuit.

An analog-to-digital conversion device comprising:

• a comparator including an input circuit for receiving a complementary input signal to generate an inversion complementary signal having the inversion logic of the complementary input signal, and a latch circuit for latching the inversion complementary signal;
• a comparative operation control circuit including a first switch for connecting or disconnecting the latch circuit and the input circuit to or from a high-potential power source according to the logic of a first signal, a second switch for connecting or disconnecting the latch circuit and the input circuit to or from a high-potential power source according to the logic of a second signal, and third and fourth switches for connecting or disconnecting the latch circuit and the input circuit to or from a high-potential power source according to the logic of a third signal;
• a delay circuit for outputting the first signal, the second signal, and the third signal;
• a successive operation control circuit for outputting a control signal for controlling the period of logic change of the first signal for controlling disconnection of the first switch, and the period of logic change of the second signal for controlling disconnection of the second switch, based on the logic of a signal latched by the latch circuit.

A signal processing device comprising:

• a filter circuit for attenuating noise from an analog reception signal;
• an amplifier for amplifying the analog reception signal of which the noise is attenuated;
• a DSP demodulator for demodulating a signal before modulation from the reception signal of which the noise is attenuated;
• an analog-to-digital circuit for converting the analog reception signal of which the noise is attenuated into a digital signal;
• wherein An analog-to-digital conversion device comprises:
• a comparator including an input circuit for receiving a complementary input signal to generate an inversion complementary signal having the inversion logic of the complementary input signal, and a latch circuit for latching the inversion complementary signal;
• a comparative operation control circuit including a first switch for connecting or disconnecting the latch circuit and the input circuit to or from a high-potential power source according to the logic of a first signal, and a second switch for connecting or disconnecting the latch circuit and the input circuit to or from a high-potential power source according to the logic of a second signal;
• a delay circuit for outputting the first signal and the second signal;
• a successive operation control circuit for outputting a control signal for controlling the period of logic change of the first signal for controlling disconnection of the first switch, and the period of logic change of the second signal for controlling disconnection of the second switch, based on the logic of a signal latched by the latch circuit.