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參數(shù)資料
| 型號： | MC13158 |
| 廠商： | Motorola, Inc. |
| 英文描述： | WIDEBAND FM IF SUBSYSTEM FOR DECT AND DIGITAL APPLICATIONS |
| 中文描述： | 寬頻帶調(diào)頻中頻DECT和數(shù)字應用子系統(tǒng) |
| 文件頁數(shù)： | 16/24頁 |
| 文件大?。?/td> | 394K |
| 代理商： | MC13158 |
MC13158
16
MOTOROLA ANALOG IC DEVICE DATA
Figure 16. System Block Diagram for Noise Analysis
Figure 17. 112 MHz LNA
Noise
Source
SAWF
LNA
Mixer
NF
Meter
150 p
Local Oscillator
fLO = 122.7 MHz
G3 = 18 dB
NF3 = 14 dB
G1 = 18 dB
NF1 = 2.7 dB
fRF = 112 MHz
G2 = 10 dB
NF2 = 10 dB
47
330 nH
270
fIF = 10.7 MHz
510
100 p
100 nH
1.0 k
8.2 k
15 k
100 n
3.5 Vdc
RF
Output
100 p
FB
100 p
100 nH
1.0 k
680 nH
100 p
MPS3906
MRF941
RF
Input
LOCAL OSCILLATORS
VHF Applications
The on–chip grounded collector transistor may be used for
HF and VHF local oscillator with higher order overtone
crystals. The local oscillator in the application circuit
(Figure 12) shows a 5th overtone oscillator at 122.7 MHz.
This circuit uses a Butler overtone oscillator configuration.
The amplifier is an emitter follower. The crystal is driven from
the emitter and is coupled to the high impedance base
through a capacitive tap network. Operation at the desired
overtone frequency is ensured by the parallel resonant circuit
formed by the variable inductor and the tap capacitors and
parasitic capacitances of the on–chip transistor and PC
board. The variable inductor specified in the schematic could
be replaced with a high tolerance, high Q ceramic or air
wound surface mount component if the other components
have tight enough tolerances. A variable inductor provides an
adjustment for gain and frequency of the resonant tank
ensuring lock up and start–up of the crystal oscillator. The
overtone crystal is chosen with ESR of typically 80
and
120
maximum; if the resistive loss in the crystal is too high
the performance of oscillator may be impacted by lower gain
margins.
A series LC network to ground (which is VCC) is comprised
of the inductance of the base lead of the on–chip transistor
and PC board traces and tap capacitors. Parasitic
oscillations often occur in the 200 to 800 MHz range. A small
resistor is placed in series with the base (Pin 28) to cancel the
negative resistance associated with this undesired mode of
oscillation. Since the base input impedance is so large a
small resistor in the range of 27 to 68
has very little effect
on the desired Butler mode of oscillation.
The crystal parallel capacitance, Co, provides a feedback
path that is low enough in reactance at frequencies of 5th
overtones or higher to cause trouble. Co has little effect near
resonance because of the low impedance of the crystal
motional arm (Rm–Lm–Cm). As the tunable inductor which
forms the resonant tank with the tap capacitors is tuned “off”
the crystal resonant frequency it may be difficult to tell if the
oscillation is under crystal control. Frequency jumps may
occur as the inductor is tuned. In order to eliminate this
behavior an inductor, Lo, is placed in parallel with the crystal.
Lo is chosen to be resonant with the crystal parallel
capacitance, Co, at the desired operation frequency. The
inductor provides a feedback path at frequencies well below
resonance; however, the parallel tank network of the tap
capacitors and tunable inductor prevent oscillation at these
frequencies.
IF Filtering/Matching
In wideband data systems the IF bandpass needed is
greater than can be found in low cost ceramic filters operating
at 10.7 MHz. It is necessary to bandpass limit with LC
networks or series–parallel ceramic filter networks. Murata
offers a series–parallel resonator pair (part number
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