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  1. ezbentley

    How to simulate a netlist with other schematics in cadence

    I have a test bench in cadence that contains multiple schematics. I want to include a block, whose sub-circuit is represented by a spectre netlist, in the simulation. Basically I am trying to associate a symbol with a netlist instead of a schematic. Can anyone help me with a detail...
  2. ezbentley

    How does spectre handle noise from s-parameter nport device?

    spectre nport I am running noise simulation and it indicates that some of the major noise contribution comes from various s-parameter models in my circuit. How does spectre calculate the noise of those models? Technically s-parameter model does not contain any information about noise.
  3. ezbentley

    How does spectre handle noise from s-parameter nport device?

    I am running noise simulation and it indicates that some of the major noise contribution comes from various s-parameter models in my circuit. How does spectre calculate the noise of those models? Technically s-parameter model does not contain any information about noise.
  4. ezbentley

    Differences between SSB, DSB, and IQ mixing

    ssb dsb Can someone explain to me the differences between "single sideband mixing," "double sideband mixing," and "IQ mixing?" Those are the terms I hear from work but don't really know what each one refers to specifically. Thanks
  5. ezbentley

    How to supress LO second harmonic in Gilbert cell mixer?

    I am designing a low voltage(1.8V) Gilbert cell mixer, which includes(from bottom to top) tail current mos, RF input mos, LO switching mos, and resistive load. Since LO has large amplitude, there would be a large common-mode second harmonic of LO at the drain of RF input mos, which may cause the...
  6. ezbentley

    Input bias of transconductor

    Since a gm cell works in an open loop fashion, how is the input bias determined? Should the gm cell include an internal biasing circuit to set the input point voltage? However, from some gm-c filter diagrams, it doesn't seem like there is internal bias, because some applications ground one of...
  7. ezbentley

    Input bias of transconductor

    Since a gm cell works in an open loop fashion, how is the input bias determined? Should the gm cell include an internal biasing circuit to set the input point voltage? However, from some gm-c filter diagrams, it doesn't seem like there is internal bias, because some applications ground one of...
  8. ezbentley

    Transconductor frequency limitation on gm-c filter?

    For op amp filters, the op amp itself must have a unity gain frequency much higher than the operating frequency of the op amp filter. Is there a similar constraint on transconductor and gm-c filter? If so, how do I quantify the relationship? For example, if I want to design a gm-c filter at...
  9. ezbentley

    CMOS high frequency gm-c filter???

    1ghz gm-c filter My boss wants me to design a tunable gm-c filter from tens of MHz up to 1GHz in 0.18um CMOS. Is this possible at all? I have been scanning through papers and the highest frequency gm-c filter I found was 350MHz. There are different structures to build transconductors. Does...
  10. ezbentley

    PSS doesn't converge with nport component

    I need to run PSS on a mixer circuit which includes a SAW filter, whose s4p file was imported using the nport component. However, no matter what convergence trick I do, the circuit just doesn't converge. The circuit without SAW can easily converge. With SAW, I dont get any error, but it always...
  11. ezbentley

    Discrepancy between s-param and z-param in spectre

    I am trying to characterize a 2-port network using spectre. Both the input and output impedances of this network is supposed to be 200ohm in the frequency band of interest. So I made two identical instances of this 2-port network. For the first instance, I connect PORT1 to the input and PORT2...
  12. ezbentley

    Simulating the effect of a SAW filter in spectre?

    Hi, I am working on a receiver in the transistor level using cadence. The receiver employs off-chip SAW filters in the signal path. How can I simulate the behavior of the SAW filters accurately? If I have the s-parameter files(such as .s4p), can I import it into cadence? If so, how do I do it...
  13. ezbentley

    Simulating the effect of a SAW filter in spectre?

    Hi, I am working on a receiver in the transistor level using cadence. The receiver employs off-chip SAW filters in the signal path. How can I simulate the behavior of the SAW filters accurately? If I have the s-parameter files(such as .s4p), can I import it into cadence? If so, how do I do...
  14. ezbentley

    Simulating the effect of a SAW filter in spectre?

    Hi, I am working on a receiver in the transistor level using cadence. The receiver employs off-chip SAW filters in the signal path. How can I simulate the behavior of the SAW filters accurately? If I have the s-parameter files(such as .s4p), can I import it into cadence? If so, how do I do...
  15. ezbentley

    SAW filter terminal impedances

    I have a questions about SAW filters. I know from my filter course that passive filters(LC, RC...) require specific source and load impedances, usually 50ohm, to function properly. Otherwise their characteristics will show considerable ripples or not function at all. Is it the same for SAW...
  16. ezbentley

    mixer pss simulation terminated prematurely without error

    analysis pss terminated prematurely due to error I am trying to simulate a down mixer using pss in spectre. The RF and LO frequencies require a small beat frequency of 35MHz. I have verified the operation of the mixer using transient. However, when I tried to find the 1dB compression point with...
  17. ezbentley

    spectre netlist generation error

    I am having problem with the netlist generated by spectre. In the Virtuoso schematic editor, I have a simple nmos with model name "nmos_rfw5" but the netlist shows: NM0 (net5 net3 0 0) subcircuit However, the correct netlist should be: NM0 (net5 net3 0 0) nmos_rfw5 This error is preventing...
  18. ezbentley

    spectre netlist generation error

    I am having problem with the netlist generated by spectre. In the Virtuoso schematic editor, I have a simple nmos with model name "nmos_rfw5" but the netlist shows: NM0 (net5 net3 0 0) subcircuit However, the correct netlist should be: NM0 (net5 net3 0 0) nmos_rfw5 This error is preventing...

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