Zoarbary
Newbie level 6
dielectric resonator oscillator
Most RF transistors need input matching and output matching(conjugate matching) to achieve maximal gain. However, the PARALLEL FEEDBACK DIELECTRIC RESONATOR OSCILLATORS(DRO) do not need the matching.
Here comes the problem: if there is no matching, the loop gain of the PARALLEL FEEDBACK DRO in Agilent ADS is too small to start oscillating, but experiments show the PARALLEL FEEDBACK DRO are ABLE to oscillate.
So I am wondering how to deal with the transistor with no matching in ADS.
See the attachment, it is a technical report from SIMENS. The PARALLEL FEEDBACK DRO in it has no matching network, but is able to oscillate. However, the simulation results in it are not done by ADS, but a software rarely seen.
Thanks for your reply.
Most RF transistors need input matching and output matching(conjugate matching) to achieve maximal gain. However, the PARALLEL FEEDBACK DIELECTRIC RESONATOR OSCILLATORS(DRO) do not need the matching.
Here comes the problem: if there is no matching, the loop gain of the PARALLEL FEEDBACK DRO in Agilent ADS is too small to start oscillating, but experiments show the PARALLEL FEEDBACK DRO are ABLE to oscillate.
So I am wondering how to deal with the transistor with no matching in ADS.
See the attachment, it is a technical report from SIMENS. The PARALLEL FEEDBACK DRO in it has no matching network, but is able to oscillate. However, the simulation results in it are not done by ADS, but a software rarely seen.
Thanks for your reply.