Difference between revisions of "MATLAB amplifier in detail"

Revision as of 18:22, 2 July 2007

The model of the SiPM amplifier is a system of 24 equations in 24 variables that has been linearized so that it can be solved by MATLAB.

Parameters and variables

The MATLAB model has a number of parameters and variables to describe the amplifier circuit, including the 24 unknowns, 4 inputs, and numerous constants.

Input parameters

There are four input parameters:

Input current: Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle I_{in}} (A)
Bias voltage: Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle V_b} (V)
Power voltage: Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle V_c} (V)
Frequency: Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle f} (Hz)

Unknown variables

There are twenty-four unknown variables. The locations (and directions in the case of currents) are labeled on the circuit diagram.

Node voltages: Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle V_1} , Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle V_2} , $V_{3}$ $V_{3}$ , $V_{4}$ $V_{4}$ , $V_{5}$ $V_{5}$ , $V_{7}$ $V_{7}$ , $V_{out}$ $V_{out}$
- Note: there is no $V_{6}$ on this circuit; it was a redundant variable with $V_{c}$ .
Resistor currents: $I_{1}$ , $I_{2}$ , $I_{3}$ , $I_{4}$ , $I_{5}$ , $I_{6}$ , $I_{7}$ , $I_{t}$
Transistor currents: $j_{b}$ , $j_{c}$ , $j_{e}$ , $k_{b}$ , $k_{c}$ , $k_{e}$
Capacitor currents: $h_{1}$ , $h_{2}$ , $h_{3}$

Constants

Resistors
- $R_{1}=100{\mbox{k}}\Omega$
- $R_{2}=10{\mbox{k}}\Omega$
- $R_{3}=5.6{\mbox{k}}\Omega$
- $R_{4}=1.2{\mbox{k}}\Omega$
- $R_{5}=1{\mbox{k}}\Omega$
- $R_{6}=53\Omega$
- $R_{7}=240\Omega$
- $R_{t}=50\Omega$

Capacitors

The capacitors are not labeled on the amplifier itself or in the documentation supplied with the amplifier, so the following values are guesses as to the capacitances. Note that Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle C_4} does not exist.

Component	Capacitance
Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle C_1}	Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle 100\mbox{nF}}
Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle C_2}	Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle 0.1\mbox{nF}}
Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle C_3}	Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle 100\mbox{nF}}
Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle C_5}	Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle 10\mbox{nF}}

Transistors

The transistor parameters used are selections from the Gummel-Poon SPICE model parameters for these two parts.

Parameter	Description	$T_{1}$ value	Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle T_2} value
VT	temperature voltage	0.0259	0.0259
BF	ideal forward maximum Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \Beta}	93	34
NF	forward current emission coefficient	0.99	1.0
IS	transport saturation current	0.24 fA	0.44 fA
ISE	B-E leakage saturation current	2.4 fA	87 fA
NE	B-E leakage emission coefficient	1.46	1.94
RB	zero-bias base resistance	21Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \Omega}	5Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \Omega}
RE	emitter resistance	0.37Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \Omega}	1Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \Omega}

@@ Line 33: / Line 33: @@
 ** <math>R_7 = 240\Omega</math>
 ** <math>R_t = 50\Omega</math>
-* Capacitors
-** <math>C_1 = 100\mbox{nF}</math>
+==== Capacitors ====
-** <math>C_2 = 0.1\mbox{nF}</math>
-** <math>C_3 = 100\mbox{nF}</math>
+The capacitors are not labeled on the amplifier itself or in the documentation supplied with the amplifier, so the following values are guesses as to the capacitances.  Note that <math>C_4</math> does not exist.
-** <math>C_5 = 10\mbox{nF}</math>
+{| align="left" border="0" cellpadding="8" cellspacing="0" style="text-align:left"
+| ''Component'' || ''Capacitance''
+|-
+| <math>C_1</math> || <math>100\mbox{nF}</math>
+|-
+| <math>C_2</math> || <math>0.1\mbox{nF}</math>
+|-
+| <math>C_3</math> || <math>100\mbox{nF}</math>
+|-
+| <math>C_5</math> || <math>10\mbox{nF}</math>
+|}
 ==== Transistors ====