Patent ID: 11929539
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 7:
8. The directional coupler according to claim 1, wherein
the first amplifier circuit includes:
a first pull-up resistor in which a power supply voltage is applied to one end thereof;
a first N-type transistor in which a gate terminal is connected to ground and a drain terminal is connected to the other end of the first pull-up resistor;
a second N-type transistor in which a gate terminal is connected to either the one end or the other end of the resistive element, and a source terminal is connected to a source terminal of the first N-type transistor; and
a first current source in which a positive side terminal is connected to each of the source terminals of the first and second N-type transistors, and a negative side terminal is connected to ground, thereby outputting a current from a drain terminal of the second N-type transistor to the first adder circuit, and wherein
the second amplifier circuit includes:
a second pull-up resistor in which a power supply voltage is applied to one end thereof;
a third N-type transistor in which a gate terminal is connected to the one end of the resistive element and a drain terminal is connected to the other end of the second pull-up resistor;
a fourth N-type transistor in which a gate terminal is connected to the other end of the resistive element, and a source terminal is connected to a source terminal of the third N-type transistor; and
a second current source in which a positive side terminal is connected to each of the source terminals of the third and fourth N-type transistors, and a negative side terminal is connected to ground, thereby outputting either the first current or the second current from a drain terminal of the fourth N-type transistor to the first adder circuit.