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PDF AN1777 Data sheet ( Hoja de datos )
| Número de pieza | AN1777 | |
| Descripción | Low Voltage Front End Circuits | |
| Fabricantes | Philips | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AN1777 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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INTEGRATED CIRCUITS
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AN1777
Low voltage front-end circuits:
SA601, SA620
M. B. Judson
1997 Aug 20
Philips
Semiconductors
1 page  
Philips Semiconductors
Low voltage front-end circuits: SA601, SA620
Application note
AN1777
www.DataSheet4U.com
iC
VCC
RC
iC2
IC
iC1
ǒ ǓDC LOAD LINE: SLOPE =
*1
RC
Q-point
vce
iB2
IB
ic
iB1
Vce
VCC
vCE
Figure 6. Graphical Analysis for the Circuitry in Figure 4
SR00004
vi +
–
VBB
VCC
iC RC
RBB
iB +
VBE
+
vCE
–
–
+
vOUT
–
RLOAD
DC Model
• Kill AC sources
• Open capacitors
• Short inductors
VBB
RBB
VCC
RC IC
+
vCE
–
vi
ǒ ǓIC +
*1
RC
VCE
)
VCC
RC
Eq. 3.
Figure 7. Basic Transistor Analysis with RLOAD
AC Model
• Kill DC sources
• Short capacitors
• Open inductors
RC
RBB
+
–
+
vCE
–
+
vOUT
–
RLOAD
ǒ ǓiC +
*1
RC
)
*1
RLOAD
(vCE)
Eq. 4.
SR00005
1995 Aug 10
5
5 Page 
Philips Semiconductors
Low voltage front-end circuits: SA601, SA620
Application note
AN1777
value, we can split the one inductor into two series inductors each
equal to L.
The series capacitor and inductor (L) at resonance will act like a
short circuit. Therefore, for this analysis we can redraw the circuit,
as seen in Figure 22, step 3.
In Step 4, the voltage source and series inductor (L) is converted
back into a current source and parallel inductor. Source
transformation, in this simple form, the values of L and C do not
change. It is the value of the current and voltage source that
changes.
www.DataSheUets4iUng.cOomhm’s Law, i=v/z and v = i(1/jωc), while Z =jωL, the imaginary
j causes the current to be negative at the resonant frequency
specified in Equation 9 of Figure 22. Therefore, by switching the
current’s direction, the negative sign disappears and the current
source is aligned in the same direction as the other one.
VIII. MATCHING THE OPEN-COLLECTOR
DIFFERENTIAL OUTPUT
Figure 23 shows the current-combiner and the open-collector
matching circuit. The collector current is increased and passes
through the load resistor which allows for more AC output swing.
Since the SA601 has differential open-collector outputs, it is possible
to implement both a current-combiner and a flexible matching circuit
(see Figure 24).
2L
iC
C
STEP 1
i
Acts like a short
at resonance
L
(i)
–+ v + jwc
L
STEP 2
Ci
L
(i)
–+ v + jwc
Ci
STEP 3
i
STEP 4
601
Acts like an open
i
at resonance
i i=
ǒ ǓiȀ
+
V
Z
+
+ * (i)
1
w2LC
STEP 5
Equation 9.
iȀ
+
–i
where
1
w2LC
+
1³
w
+
1
ǸLC
Figure 22. Equivalent Circuit Transformations at Resonance
STEP 6
VCC
2i
SR01282
iC RC LC
Σ
2iC
iC
Step 2.
RLOAD
Current
Combiner
Power Combiner
Matching
Network
Figure 23. Power Combiner
SR00016
1995 Aug 10
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AN1777.PDF ] | |
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