Filter circuitry using active inductor

A transceiver, comprising:

• a filter circuitry comprising
• a first transistor having a first terminal, a second terminal and a third terminal;
• a second transistor having a first terminal, a second terminal and a third terminal;
• a first switch and a second switch;
• a first capacitor and a second capacitor;
• and
• a resistor;
• wherein
• the first terminal of the first transistor, a first terminal of the first switch and a first terminal of the first capacitor are connected to a first terminal of the filter circuitry;
• the first terminal of the second transistor, a first terminal of the second switch and a first terminal of the second capacitor are connected to a second terminal of the filter circuitry;
• the second terminal of the first transistor, the second terminal of the second transistor and a first terminal of the resistor are connected together;
• the third terminals of the first and second transistors are connected together;
• a second terminal of the first switch, a second terminal of the second switch and a second terminal of the resistor are connected together;
• second terminals of the first and second capacitors are connected to a signal ground;
• and wherein
• the filter circuitry is configurable to either have the first terminal as input and the second terminal as output or have the first terminal as output and the second terminal as input by changing on-off states of the first and second switches;
• a data converter;
• and
• a mixer;
• wherein the first terminal of the filter circuitry is coupled to the data converter, the second terminal of the filter circuitry is coupled to the mixer, and wherein when the first switch is turned on and the second switch is turned off, the filter circuitry is operating in transmitting mode, when the first switch is turned off and the second switch is turned on, the filter circuitry is operating in receiving mode.

An electronic device, comprising:

• a filter circuitry comprising
• a first transistor having a first terminal, a second terminal and a third terminal;
• a second transistor having a first terminal, a second terminal and a third terminal;
• a first switch and a second switch;
• a first capacitor and a second capacitor;
• and
• a resistor;
• wherein
• the first terminal of the first transistor, a first terminal of the first switch and a first terminal of the first capacitor are connected to a first terminal of the filter circuitry;
• the first terminal of the second transistor, a first terminal of the second switch and a first terminal of the second capacitor are connected to a second terminal of the filter circuitry;
• the second terminal of the first transistor, the second terminal of the second transistor and a first terminal of the resistor are connected together;
• the third terminals of the first and second transistors are connected together;
• a second terminal of the first switch, a second terminal of the second switch and a second terminal of the resistor are connected together;
• second terminals of the first and second capacitors are connected to a signal ground;
• and wherein
• the filter circuitry is configurable to either have the first terminal as input and the second terminal as output or have the first terminal as output and the second terminal as input by changing on-off states of the first and second switches.