參數(shù)資料
型號(hào)： TK14489V
廠商： TOKO INC
元件分類： 接收器
英文描述： FM, AUDIO SINGLE CHIP RECEIVER, PDSO20
封裝： TSSOP-20
文件頁(yè)數(shù)： 15/25頁(yè)
文件大小： 2570K
代理商： TK14489V
TK14489V
GC3-E011E
Page 22
Figure 11: Examples of Phase Shifter
i) RCL Resonance circuit
ii) Ceramic Discriminator
10pF
Vcc
R
D
9
Vcc
10
R
L
10pF
Vcc
R
D
9
Vcc
10
R
L
C
(1)RCL Phase Shifter Constants Establishment
Figure 12: RCL Phase Shifter Constants Establishment
Vcc
10pF
Vcc
LIMITTER
OUTPUT
R
D
9
Vcc
10
R
L
DETECTOR
35
R
L
is the resistor, the limitter amplifier resistor, that
decide signal level inputted from limitter amplifier output
into phase shifter. Below equation sets this signal level.
2
35
9
@
×
=
A
R
V
L
PIN
O
(3)
R
D is Q-damping resistor of phase shifter.
The signal level is able to be controlled by R
L and RD. At
the points of demodulation sensitivity and distortion,
please set up R
L and RD as pin 10 output level is 100mVP-
P more .
(2)Ceramic Discriminator Phase Shifter
Constants Establishment
Setting up phase shifter constants(C, R
L,
R
D)
using
ceramic discriminator, cut and try them according to
below order.
1) Set up R
D that is given as the expected output voltage.
2) Set up C as THD becomes minimum in the case that
the change or R
D causes minimum THD point change.
3) Output voltage is change as C is changed, so set up R
D
that is given as the expected output voltage again.
4) Search the constants that the expected output voltage
point corresponds with minimum THD point.
5) Rise R
L if adjustment of 4) rise up output voltage even
the expected.
Refer
"TYPICAL
CHARACTERIS
TICS"
about
characteristics behavior in according to changes of
constants, C, R
L, RD.
12-5-3. Audio Output
After quadrature detecting, the audio signal is outputted
from pin 11 through an emitter follower.
The needful signal is pulled out through LPF.
(1)Waveform Distortion Improvement
In the cases that output voltage is very large, or heavy
load is connected with demodulated output, it happens the
drive power of demodulated output being short, so the
waveform distortion occurs at minus half cycle. Shown in
fig13, demodulated output is an emitter follower. So it is
able to improve the waveform distortion being connected
with resistor between pin 11 and GND. This is effective
that the emitter follower drive current increase.
Figure 13: Demodulated Output Drive Current Increase
Vcc
11
60
I
0
i
12-5-4. For Stable Operation
To prevent worsening the distortion, observe the
following notes:
(1) Demodulated Output Voltage (Pin 11)
Too large of a demodulated output voltage will worsen
the distortion due to the dynamic range of the
demodulator.
(2) The Signal Level in Phase Shifter (Pin 10)
If the phase shifter signal level is too small, the noise
level grows worse. This will cause the distortion to
grow worse.
(3) Band Width of Phase Shifter (Pin 10)
If the bandwidth of the phase shifter is narrower than IF
bandwidth, including the demodulated element, the
distortion will grow worse.
12-6. Filter Amplifier
This block is the inverting OPAMP block. The OPAMP
has superior temperature characteristics, can be capable
of a filter amplifier for noise detector and so on. pin 13 is
input port, pin 14 is output port. The filter amplifier and
external parts constitute noise-remove BPF.
12-6-1. Inverting OP Amp
It show in fig. 14 as a example of inverting OPAMP
component. Its gain F
C is expressed as below. The minus
symbol in the expression means phase inverting from
input to output (180
°).
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