[ibis-macro] Re: Replacing BIRD 122 with "Reserved_Model" keyword in [External Model]
- From: Scott McMorrow <scott@xxxxxxxxxxxxx>
- To: Arpad_Muranyi@xxxxxxxxxx
- Date: Tue, 17 Jan 2012 19:39:57 -0500
Arpad
Walter is doing more than linearizing. He's reducing to a zeroith order
model.
On Jan 17, 2012 7:36 PM, "Muranyi, Arpad" <Arpad_Muranyi@xxxxxxxxxx> wrote:
> James,****
>
> ** **
>
> I think by “small signal” Walter means what is described****
>
> in this article:****
>
> ** **
>
> http://en.wikipedia.org/wiki/Small-signal_model****
>
> ** **
>
> Thanks,****
>
> ** **
>
> Arpad****
>
> ===========================================================****
>
> ** **
>
> *From:* ibis-macro-bounce@xxxxxxxxxxxxx [mailto:
> ibis-macro-bounce@xxxxxxxxxxxxx] *On Behalf Of *James Zhou
> *Sent:* Tuesday, January 17, 2012 5:25 PM
> *To:* wkatz@xxxxxxxxxx; IBIS-ATM
> *Subject:* [ibis-macro] Re: Replacing BIRD 122 with "Reserved_Model"
> keyword in [External Model]****
>
> ** **
>
> Hi Walter, ****
>
> ** **
>
> Please see my comments and questions below: ****
>
> ** **
>
> (1) "This implies that AMI modeling assumes a small signal interface to
> the analog channel." ****
>
> Can you please clarify the meaning of "a small signal interface"? The only
> necessary assumption when representing a channel using impulse response is
> that the channel must be LTI. ****
>
> ** **
>
> (2) "This also implies that the differential impedance of a Tx or Rx is
> constant over the operating range of the device."****
>
> There are several possible cases of "impedance of a Tx or Rx". It could be
> the input or, the output or, the load impedance of Tx analog block. Please
> clarify which one is referred to by this statement. Same questions exist
> for Rx. ****
>
> ** **
>
> Thanks,****
>
> James Zhou****
>
> QLogic Corp.****
>
> ** **
>
> ****
>
> ** **
>
> ** **
>
> ** **
>
> *From:* ibis-macro-bounce@xxxxxxxxxxxxx
> [mailto:ibis-macro-bounce@xxxxxxxxxxxxx] *On Behalf Of *Walter Katz
> *Sent:* Tuesday, January 17, 2012 1:16 PM
> *To:* IBIS-ATM
> *Subject:* [ibis-macro] Replacing BIRD 122 with "Reserved_Model" keyword
> in [External Model]****
>
> ** **
>
> All,****
>
> ** **
>
> I would like to extend BIRD 116 to allow the following for AMI [Model]s***
> *
>
> ** **
>
> [External Model]****
>
> Language ISS****
>
> Reserved_ModelAMI_Tstonefile_Tx|AMI_Tstonefile_Rx|AMI_Thevenin_Tx|AMI_Thevenin_Rx
> ****
>
> [End External Model]****
>
> ** **
>
> AMI modeling assumes that a channel can be represented by an Impulse
> Response. This implies that AMI modeling assumes a small signal interface
> to the analog channel. This also implies that the differential impedance of
> a Tx or Rx is constant over the operating range of the device. Note that
> any legacy IBIS model (IV, Vt curves, Series Pin), that when used in the
> real operating range of a SerDes channel (where AMI modeling is applicable)
> can be accurately represented by the following Thevenin Tx and Rx models.
> ****
>
> ** **
>
> ** **
>
> *Reserved_Model AMI_Tstonefile_Tx*
>
> [External Model] ****
>
> Language ISS ****
>
> Reserved_Model AMI_Tstonefile_Tx****
>
> [End External Model]****
>
> ** **
>
> Is equivalent to:****
>
> ** **
>
> [External Model] ****
>
> Language ISS ****
>
> Corner Typ AMI_Tstonefile_Tx.cir AMI_Tstonefile_Tx****
>
> Parameters Tstonefile = AMIfile(Tstonefile) | Tstonefile must be an AMI
> Model_Specific parameter****
>
> Converter_Parameters Vhi = AMIfile(Voh) | Voh must be an AMI
> Model_Specific parameter****
>
> Converter_Parameters Vlo = AMIfile(Vol) | Vol is 0 if it is not an AMI
> Model_Specific parameter ****
>
> Converter_Parameters Trf = 1.0ps ****
>
> Ports my_driveP my_driveN A_signal_pos A_signal_neg****
>
> D_to_A D_drive my_driveP 0 Vlo Vhi Trf Trf Typ Non-Inverting ****
>
> D_to_A D_drive my_driveN 0 Vlo Vhi Trf Trf Typ Inverting ****
>
> [End External Model]****
>
> ** **
>
> AMI_Tstonefile_Tx.cir.****
>
> ** **
>
> .SUBCKT AMI_Tstonefile_Tx my_driveP my_driveN A_signal_pos A_signal_neg **
> **
>
> + Tstonefile=“NA.s4p” ****
>
> Sdriver my_driveP my_driveN A_signal_pos A_signal_neg 0 MNAME=Smodel_name*
> ***
>
> .MODEL Smodel_name S N=4 TSTONEFILE=Tstonefile****
>
> .ends****
>
> ** **
>
> ** **
>
> *Reserved_Model AMI_Tstonefile_Rx*
>
> ** **
>
> ** **
>
> [External Model] ****
>
> Language ISS ****
>
> Reserved_Model AMI_Tstonefile_Rx****
>
> [End External Model]****
>
> ** **
>
> Is equivalent to:****
>
> ** **
>
> [External Model] ****
>
> Language ISS ****
>
> Corner Typ AMI_Tstonefile_Rx.cir AMI_Tstonefile_Rx****
>
> Parameters Tstonefile = AMIfile(Tstonefile) ****
>
> Ports A_signal_pos A_signal_neg A_int_pos A_int_neg****
>
> A_to_D D_receive A_int_pos A_int_neg -.02 .02 Typ****
>
> [End External Model]****
>
> ** **
>
> AMI_Tstonefile_Rx.cir.****
>
> ** **
>
> .SUBCKT AMI_Tstonefile_Rx A_signal_pos A_signal_neg A_int_pos A_int_neg **
> **
>
> + Tstonefile=“NA.s4p” ****
>
> Sdriver A_signal_pos A_signal_neg A_int_pos A_int_neg 0 MNAME=Smodel_name
> ****
>
> .MODEL Smodel_name S N=4 TSTONEFILE=Tstonefile****
>
> .ends****
>
> ** **
>
> ** **
>
> *Reserved_Model AMI_Thevenin_Tx*
>
> * *
>
> [External Model] ****
>
> Language ISS ****
>
> Reserved_Model AMI_Thevenin_Tx****
>
> [End External Model]****
>
> ** **
>
> Is equivalent to:****
>
> ** **
>
> [External Model] ****
>
> Language ISS ****
>
> Corner Typ AMI_*Thevenin*_Tx.cir AMI* Thevenin*_Tx****
>
> Parameters Rt = AMIfile(Rt) ****
>
> Parameters Rs = AMIfile(Rs) ****
>
> Parameters Cc = AMIfile(Cc) ****
>
> Parameters Vt = AMIfile(Vt) ****
>
> Parameters Cac = AMIfile(Cac) ****
>
> Parameters Rac = AMIfile(Rac) ****
>
> Parameters Rd = AMIfile(Rd) ****
>
> Parameters Cd = AMIfile(Cd)****
>
> Parameters Trf = AMIfile(Trf)****
>
> | Only AMI Model_Specific parameters Rt Rs Cc Vt Cac Rac Rd Cd defined in
> the ****
>
> | .ami file shall be passed as parameters to the subckt AMI* Thevenin*_Tx
> instance****
>
> Converter_Parameters Vhi = AMIfile(Voh) | Voh must be an AMI
> Model_Specific parameter****
>
> Converter_Parameters Vlo = AMIfile(Vol) | Vol is 0 if it is not an AMI
> Model_Specific parameter ****
>
> Converter_Parameters Trf = AMIfile(Trf) | Trf is 1p if it is not an AMI
> Model_Specific parameter ****
>
> Ports my_driveP my_driveN A_signal_pos A_signal_neg****
>
> D_to_A D_drive my_driveP 0 Vlo Vhi Trf Trf Typ Non-Inverting ****
>
> D_to_A D_drive my_driveN 0 Vlo Vhi Trf Trf Typ Inverting ****
>
> [End External Model]****
>
> ** **
>
> AMI_*Thevenin*_Tx.cir****
>
> ** **
>
> .SUBCKT AMI_*Thevenin*_Tx my_driveP my_driveN A_signal_pos A_signal_neg **
> **
>
> + Rt=1Meg Rs=1Meg Cc=0. Vt=0. Cac=0. Rac=1Meg Rd=1Meg Cd=0.****
>
> E_H E_my_driveP 0 VCVS my_driveP 0 1.****
>
> E_L E_my_driveN 0 VCVS my_driveN 0 1.****
>
> R_Rs_H E_my_driveP A_signal_pos R=’Rs’****
>
> R_Rs_L E_my_driveN A_signal_neg R=’Rs’****
>
> R_Rd A_signal_pos A_signal_neg R=’Rd’****
>
> C_Rd A_signal_pos A_signal_neg C=’Cd’****
>
> R_Rt_H A_signal_pos Vt R=’Rt’****
>
> R_Rt_H A_signal_neg Vt R=’Rt’****
>
> V_Vt Vt 0 DC=’Vt’****
>
> C_Cc_H A_signal_pos 0 C=’Cc’****
>
> C_CC_L A_signal_neg 0 C=’Cc’****
>
> R_ac A_signal_pos Nac R=’Rac’****
>
> C_ac A_signal_neg Nac C=’Cac’****
>
> .ends ****
>
> ** **
>
> ** **
>
> ** **
>
> *Reserved_Model AMI_Thevenin_Rx*
>
> ** **
>
> * *
>
> [External Model] ****
>
> Language ISS ****
>
> Reserved_Model AMI_Thevenin_Rx****
>
> [End External Model]****
>
> ** **
>
> Is equivalent to:****
>
> ** **
>
> ** **
>
> [External Model] ****
>
> Language ISS ****
>
> Corner Typ *AMI_Thevenin_Rx*.cir *AMI_Thevenin_Rx*****
>
> Parameters Rt = AMIfile(Rt) ****
>
> Parameters Cc = AMIfile(Cc) ****
>
> Parameters Vt = AMIfile(Vt) ****
>
> Parameters Cac = AMIfile(Cac) ****
>
> Parameters Rac = AMIfile(Rac) ****
>
> Parameters Rd = AMIfile(Rd) ****
>
> Parameters Cd = AMIfile(Cd)****
>
> |Only AMI Model_Specific parameters Rt Cc Vt Cac Rac Rd Cd defined in the
> ****
>
> |.ami file shall be passed as parameters to the subckt AMI* Thevenin*_Tx
> instance****
>
> Ports A_signal_pos A_signal_neg A_int_pos A_int_neg****
>
> A_to_D D_receive A_int_pos A_int_neg -.02 .02 Typ****
>
> [End External Model]****
>
> [External Model] ****
>
> ** **
>
> ** **
>
> *AMI_Thevenin_Rx*.cir.****
>
> ** **
>
> .subckt *AMI_Thevenin_Rx* A_signal_pos A_signal_neg A_int_pos A_int_neg **
> **
>
> + Rt=1Meg Cc=0. Vt=0. Cac=0. Rac=1Meg Rd=1Meg Cd=0.****
>
> E_H A_int_pos 0 VCVS A_signal_pos 0 1.****
>
> E_L A_int_neg 0 VCVS A_signal_neg 0 1.****
>
> R_Rd A_signal_pos A_signal_neg R=’Rd’****
>
> C_Rd A_signal_pos A_signal_neg C=’Cd’****
>
> R_Rt_H A_signal_pos Vt R=’Rt’****
>
> R_Rt_H A_signal_neg Vt R=’Rt’****
>
> V_Vt Vt 0 DC=’Vt’****
>
> C_Cc_H A_signal_pos 0 C=’Cc’****
>
> C_CC_L A_signal_neg 0 C=’Cc’****
>
> R_ac A_signal_pos Nac R=’Rac’****
>
> C_ac A_signal_neg Nac C=’Cac’****
>
> .ends ****
>
> ** **
>
> Walter Katz****
>
> wkatz@xxxxxxxxxx****
>
> Phone 303.449-2308****
>
> Mobile 720.333-1107****
>
> ** **
>
> ** **
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