Push-pull buffer circuit

A system comprising:

• a controller adapted to be coupled to a connector, the controller configured to provide power to the connector, the controller comprising:
• an amplifier configured to send a fixed frequency signal to the connector, the amplifier comprising:
• a buffer circuit comprising:
• a first transistor having a first current terminal, a second current terminal, and a control terminal, the first current terminal directly connected to an output terminal, and the control terminal directly connected to an input terminal;
• a second transistor having a first current terminal, a second current terminal, and a control terminal, the first current terminal coupled to the second current terminal of the first transistor, the control terminal coupled to a bias voltage terminal, and the first and second transistors are opposite transistor types;
• a third transistor having a first current terminal, a second current terminal, and a control terminal, the first current terminal coupled to the output terminal, the second current terminal coupled to a ground terminal, and the control terminal coupled to the second current terminal of the second transistor;
• and
• a fourth transistor having a first current terminal, a second current terminal, and a control terminal, the first current terminal coupled to the second current terminal of the second transistor, the second current terminal coupled to the ground terminal, and the control terminal coupled to the second current terminal of the third transistor.

A circuit, comprising:

• a preamplifier circuit having an input and an output;
• a buffer circuit comprising:
• a first transistor having a first current terminal, a second current terminal, and a control terminal, the first current terminal directly connected to the input of the preamplifier circuit and the control terminal directly connected to the output of the preamplifier circuit;
• a second transistor having a first current terminal, a second terminal, and a control terminal, the first current terminal coupled to the second current terminal of the first transistor, the control terminal coupled to a bias voltage terminal, and the first and second transistors are opposite transistor types;
• a third transistor having a first current terminal, a second current terminal, and a control terminal, the first current terminal coupled to the input of the preamplifier circuit, and the control terminal coupled to the second current terminal of the second transistor;
• and
• a fourth transistor having a first current terminal, a second current terminal, and a control terminal, the first current terminal coupled to the second current terminal of the second transistor, and the control terminal coupled to the second current terminal of the second transistor.