Wideband filter with resonators and inductors
Aspects of the disclosure are directed to a bandpass filter including a first, second, third and fourth resonators, wherein the second and third resonators are in parallel, wherein the first resonator includes a first and second terminals, wherein the second resonator includes a second resonator top terminal and a second resonator bottom terminal, wherein the third resonator includes a third resonator top terminal and a third resonator bottom terminal, wherein the fourth resonator includes a third terminal and a fourth terminal; wherein the first terminal is coupled to the second resonator top terminal, wherein the second terminal is coupled to the third resonator top terminal, wherein the third terminal is coupled to the third resonator bottom terminal, wherein the fourth terminal is coupled to the second resonator bottom terminal; a first inductor coupled to the first and third terminals; and a second inductor coupled to the second and fourth terminals.
1. A bandpass filter in an integrated circuit (IC) comprising:
a plurality of resonators including a first resonator, a second resonator, a third resonator and a fourth resonator, and wherein the second resonator and the third resonator are in parallel, and
wherein the first resonator includes a first terminal and a second terminal,
wherein the second resonator includes a second resonator top terminal and a second resonator bottom terminal;
wherein the third resonator includes a third resonator top terminal and a third resonator bottom terminal,
wherein the fourth resonator includes a third terminal and a fourth terminal, and
wherein the first terminal is coupled to the second resonator top terminal,
wherein the second terminal is coupled to the third resonator top terminal,
wherein the third terminal is coupled to the third resonator bottom terminal,
wherein the fourth terminal is coupled to the second resonator bottom terminal; and
a first inductor coupled to the first terminal and the third terminal; and
a second inductor coupled to the second terminal and the fourth terminal; and
a first resistor connected in parallel with the first inductor and a second resistor connected in parallel with the second inductor.
2. The bandpass filter in an integrated circuit (IC) of claim 1 , wherein an impedance of the first resistor and the second resistor is approximately 50 ohms.