摘要:
PROBLEM TO BE SOLVED: To provide a multistage differential amplifier that reconciles band broadening and gain reduction suppression.SOLUTION: The multistage differential amplifier includes a plurality of differential amplifiers connected in series, and a DC component cutoff section for cutting off a DC component of input signals. The DC component cutoff section is arranged between the plurality of differential amplifiers, and a transistor size of a first differential amplifier arranged just behind the DC component cutoff section is equal to or greater than a transistor size of a second differential amplifier arranged two stages before the DC component cutoff section.
摘要:
PROBLEM TO BE SOLVED: To provide an ASK modulation amplifier circuit capable of improving the linearity of modulation depth when a level of a modulation signal is low and capable of obtaining an output signal with large amplitude.SOLUTION: A high-frequency signal and a modulation signal are supplied to a first amplifier, and amplification and ASK modulation of the high-frequency signal are performed. The first amplifier is set to have a bias that does not output a modulation output signal by a first control block in a state that the modulation signal is not supplied. An output signal of the first amplifier and the modulation signal are supplied to the second amplifier. The amplification factor of the second amplifier is set to be higher than the amplification factor of the first amplifier by a second control block.
摘要:
PROBLEM TO BE SOLVED: To correct an offset voltage of an amplification circuit with high precision.SOLUTION: A semiconductor device includes: an amplification circuit having an inverting input terminal, a non-inverting input terminal and an output terminal; a first variable voltage source for generating a first bias voltage having a voltage value depending on a first set value; a second variable voltage source for generating a second bias voltage having a voltage value depending on a second set value; a first resistor connected at one end to the inverting input terminal; a second resistor connected between the output terminal and the inverting input terminal; a third resistor connected at one end to the non-inverting input terminal; and a fourth resistor connected between the second variable voltage source and the non-inverting input terminal. The first bias voltage is fed to at least one of the other end of the first resistor and the other end of the third resistor, and an input signal is fed to at least the other of the other end of the first resistor and the other end of the third resistor.
摘要:
PROBLEM TO BE SOLVED: To provide an inverting amplification circuit that outputs a high precision amplification result.SOLUTION: According to an embodiment, an inverting amplification circuit 1 includes: an operational amplifier OPA for amplifying a differential voltage between an input voltage supplied to an inverting input terminal and a reference voltage supplied to a non-inverting input terminal to output an amplified signal; a feedback resistor RFBT for negatively feeding the amplified signal back to the inverting input terminal of the operational amplifier OPA; and a variable resistor section PVIC1 for setting a current path with a first resistance value depending on a control signal between an external input terminal INT and the inverting input terminal of the operational amplifier OPA, and setting a first bypass path with a second resistance value depending on the control signal between a node on the current path and a reference voltage terminal GND supplied with the reference voltage.
摘要:
A switchable integrated electronic device includes at least three elements r1 . . . r14, s1 . . . s14 series coupled in a chain between a first port and a second port and includes a node between successive elements r1 . . . r14, s1 . . . s14 of the chain. There is a switch means for coupling a selectable one of the nodes to a third port. If successive elements r1 . . . r14, s1 . . . s14 in the chain are denoted ri, i=1 to N, and if adjacent positions occupied by the elements are numbered consecutively 1 to N, then element ri occupies position ⌊ N + 1 2 ⌋ + ( - 1 ) i · 2 · ⌊ i 2 ⌋ for i = 1 to ⌊ N 2 ⌋ and position ⌊ N + 1 2 ⌋ + ( - 1 ) i · ( 2 · ⌊ N - i 2 ⌋ + 1 ) for i = ⌊ N 2 ⌋ + 1 to N .