Wide-band amplifier
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsMiyo Miyashita, Masaaki Shimada, Kazuya Yamamoto
Life of this patent
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Abstract
A differential amplifier is connected to a push-pull-type source follower circuit that receives biphase signals. The source follower circuit has a first set of FETs including a first source follower FET and a first current source FET and a second set of FETs including a second source follower FET and a second current source FET. A first coupling capacitance element connects the first current source FET and the second source follower FET, and a second coupling capacitance element connects the second current source FET and the first source follower FET. A diode or a resistor connects the source terminals of the first and second current source FETs to a voltage source.
Claims18
A wide-band amplifier comprising:
- a push-pull-type source follower circuit receiving biphase signals, said circuit including:
- a first set of FETs including a first source follower FET and a first current source FET and a second set of FETs including a second source follower FET and a second current source FET, source terminals of the first and second current FETs being connected to each other;
- a first coupling capacitance element connecting the first current source FET and the second source follower FET;
- a second coupling capacitance element connecting the second current source FET and the first source follower FET;
- and
- an element having a resistance component and connecting a connecting point of the source terminals of the first and second current source FETs to a voltage source.
A wide-band amplifier comprising:
- a push-pull-type source follower circuit receiving biphase signals, said circuit including:
- a first set of FETs including a first source follower FET and a first current source FET and a second set of FETs including a second source follower FET and a second current source FET;
- a first coupling capacitance element connecting the first current source FET and the second source follower FET;
- a second coupling capacitance element connecting the second current source FET and the first source follower FET;
- resistors connecting respective source terminals of the first and second current source FETs to a voltage source;
- and
- bypass capacitance elements connected in parallel to the respective resistors.
A wide-band amplifier comprising:
- a plurality of source follower circuits receiving biphase signals and connected in series, each of the source follower circuits comprising a first set of FETs including a first source follower FET and a first current source FET and a second set of FETs including a second source follower FET and a second current source FET;
- and
- a peaking circuit provided in series between output terminals of an upstream source follower circuit and input terminals of a downstream source follower circuit, the peaking circuit comprising first and second inductors and being in series resonance with the downstream source follower circuit.
A wide-band amplifier comprising:
- a source follower circuit receiving biphase signals, said circuit including:
- a first set of FETs including a first source follower FET and a first current source FET and a second set of FETs including a second source follower FET and a second current source FET;
- and
- a capacitor provided between a gate terminal and a source terminal of each of the first and second current source FETs so that the capacitor and each of the first and second current source FETs constitute a reactance circuit.
Dependencies are inferred from the claim text.