Download Analog VHDL by Andrzej T. Rosinski, Alain Vachoux PDF

By Andrzej T. Rosinski, Alain Vachoux

Analog VHDL brings jointly in a single position very important contributions and up to date study leads to this fast-paced region.
Analog VHDL serves as a great reference, delivering perception into one of the most hard study concerns within the field.

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Additional resources for Analog VHDL

Example text

V+ in1_neg. 0) ) *th ( (in2J)os. v+ in2_neg. v) Ik) - Gout *outp. v) * (exp ( (vout_min -outp. Ol*k)); else outp. i %= - (vsat*Gm*th ( (in1J)os. v-in1_neg. v + voff1) Ivsat) Gout *outp. v) *th ( (in2J)os. v-in2_neg. 0) ) *th ( (in1J)os. v+ in1_neg. 0) ) *th ( (in2J)os. v+ in2_neg. 0 - exp ( (vout_min -outp. 01 *k) ) ; end if; end if; end if; end if; end relation; END ARCHITECTURE functional1; B. unctionall of guassian is variable m : analog; -A function to be multipliedby the ideal current to account for nonidealities variable vth2 : analog; BEGIN RELATION PROCEDURAL FOR INIT = > Ipeak : = 10.

1 ... ... i - ... '" ......... _I ... .... - ... 1- ............ J '''' ... - ............. 5 Vi-V2:'5~V-2 -1 0 3 2 4 5 6 Vout(V) *Model-Circuit Fig. 4. Comparison between the circuit and model of the wide range Gilbert multiplier output characteristics. and the circuit represent the output current of the multiplier as a function of the second differential voltage (V3 - V 4 ) for different values of the first differential voltage (VI - V2 ). 6% average error. Nonideal effects as the finite output conductance and the variation of currents at small and large output voltages are shown in Fig.

Instead of forcing a mathematical model onto a limited set of defined components, the model can be implemented directly. A number of VHDL-AMS models (or to be precise, models based on the implementation of the draft) have been written which illustrate this, Fig. 2 shows a SPICE and VHDL-AMS implementation of a voltage limiter. For the SPICE model a number of standard components are required to achieve the desired function where as in the VHDL-AMS implementation a simpler mathematical description is used.

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