Amplificacion Intermodulacion

Marco teorico:
Intercept Point (Single-Tone Excitation): IP_1

Measurement Type
Nonlinear Power
Description
This measurement computes the nth-order intercept point of a circuit with a single tone excitation. The intercept point is the point at which a linear extrapolation of the fundamental power and the power in the intermodulation product intercept each other (when shown as dBm inversus dBm out). An example of the 3rd order intercept point of a two tone excitation is shown below. The one-tone intercept point measures the intercept point of the fundamental and one of the harmonics of the fundamental, but conceptually it is similar to the two-tone 3rd order intercept point shown.

The nth order intercept point should be performed in the small-signal operating region of thedevice. In the example of the figure above, the points marked with circles would be a good choice as a point for measuring the intercept point. Since for the particular order of intercept point, the slope of both lines is known, a measurement at a single power point is sufficient to determine the intercept point (assuming the point is in the small signal region).
The point at which the twointersect is given from
IP=PF0+PF0-PN0n-1
PF0 : la potencia de salida de la componente fundamental en dBm.
PN0 : es la potencia de salida de la orden enésimo armónico.
n : es el orden del armónico (por un solo tono se analiza la segunda armónica sería del orden de 2).
where PFo is the output power of the fundamental component in dBm, PNo is the output power of the nth order harmonic, and n isthe order of the harmonic (for a single tone analyses the 2nd harmonic would be of order 2).
Parameters
Name | Type | Range |
Data Source Name | Subcircuit | 0 to 1000 ports |
Output Power Meas. Component (element used to measure power) | String | N/A |
IM Product (h1) | Integer value | 1 to 1000 |
Result
This measurement returns a real value in power in dBm. The measurement canbe displayed in dB by selecting the 'dB' option in the measurement dialog. The x-axis for this measurement is in frequency units.
Graph Types
This measurement can be displayed on a rectangular graph or tabular grid.
Options
Smoothing is not allowed for this measurement. This measurement always uses the frequencies specified in the document.

Diseñar un Amplificador con Ic=5mA, Vcc=2.4v,Máxima excursión, β=200, F=500 MHz.

Ic=5 mA
β=200
F=500 MHz
Vce=1.2v
Vbe=0.7v

VCC - ICRC - VCE=0
VCC – IBRB – VBE=0
IB=ICβ=5 mA200=25μA

VCC - ICRC - VCE=0
Rc=VCC-VCE5 mA=2.4-1.25 mA=238.8 Ω

VCC – ICRC – IBRB – VBE=0
RB=VCC-VBE-IcRCIB=2.4-0.7-1.225 μA=20 KΩ

Calculo del punto de intermodulación
IP=PF0+PF0-PN0n-1
* PF0 : la potencia de salida de la componentefundamental en dBm.
* PN0 : es la potencia de salida de la orden enésimo armónico.
* n : es el orden del armónico (por un solo tono se analiza la segunda armónica sería del orden de 2).
PF0 : -33.193 dBm.
PN0 : -80.491 dBm.
n : 2

IP=-33.193+-33.193+80.4912-1= 14.105

Calculo para obtener el punto de compresion de ganancia
Ganancia – 1 dB = Punto de compresion de ganancia.
8 dB – 1 dB= 7 dB.

Diagramas de un Amplificador con Ic=5mA, Vcc=2.4v, Máxima excursión, β=200, F=500 MHz.
Obtención de ganancia y la respuesta en frecuencia:

Obtener los armónicos:

Obtener los productos de intermodulación:

Obtener la compresión de ganancia de 1 dB:

Respuesta en graficas
Ganancia de un Amplificador con Ic=5mA, Vcc=2.4v, Máxima excursión, β=200, F=500 MHz.

Respuesta enfrecuencia de un Amplificador con Ic=5mA, Vcc=2.4v, Máxima excursión, β=200, F=500 MHz.

Armónicos de un Amplificador con Ic=5mA, Vcc=2.4v, Máxima excursión, β=200, F=500 MHz.

Producto de Intermodulación de un Amplificador con Ic=5mA, Vcc=2.4v, Máxima excursión, β=200, F=500 MHz..

Compresión de ganancia de 1 dB de un Amplificador con Ic=5mA, Vcc=2.4v, Máxima excursión, β=200, F=500 MHz....