MC13155 Motorola, MC13155 Datasheet - Page 3

• Manufacturer Part Number: MC13155
• Description: WIDEBAND FM IF
• Manufacturer: Motorola

amplifier, a wideband quadrature detector which may be
operated up to 200 MHz, and a received signal strength
Evaluation PC Board
versatile and is designed to cascade two ICs. The center
section of the board provides an area for attaching all surface
mount components to the circuit side and radial leaded
components to the component ground side of the PCB (see
Figures 17 and 18). Additionally, the peripheral area
surrounding the RF core provides pads to add supporting
and interface circuitry as a particular application dictates.
This evaluation board will be discussed and referenced in
this section.
Limiting Amplifier
stage limiting amplifier provide a differential power gain of
typically 46 dB and useable frequency range of 300 MHz.
The IF gain flatness may be controlled by decoupling of the
internal feedback network at Pins 2 and 15.
MOTOROLA ANALOG IC DEVICE DATA
The MC13155 consists of a wideband three–stage limiting
The evaluation PCB shown in Figures 19 and 20 is very
Differential input and output ports interfacing the three
V in
Limiter 1
Output
Output
Video
330
49.9
1.0n
1.0n
APPLICATIONS INFORMATION
CIRCUIT DESCRIPTION
Figure 2. Test Circuit
1
2
3
4
5
6
7
8
IN1
DEC1
V CC 1
DETO1
DETO2
V CC 2
LIMO1
QUAD1
MC13155
260n
499
20p
QUAD2
indicator (RSSI) circuit which provides a current output
linearly proportional to the IF input signal level for
approximately 35 dB range of input level.
the IF as a two port linear amplifier is useful to implement
maximum stable power gain, input matching, and stability
over a desired bandpass response and to ensure stable
operation outside the bandpass as well. The MC13155 is
unconditionally stable over most of its useful operating
frequency range; however, it can be made unconditionally
stable over its entire operating range with the proper
decoupling of Pins 2 and 15. Relatively small decoupling
capacitors of about 100 pF have a significant effect on the
wideband response and stability. This is shown in the
scattering parameter tables where S–parameters are shown
for various values of C2 and C15 and at V EE of – 3.0 and
– 5.0 Vdc.
LIMO2
DEC2
Buffer
V EE 1
V EE 2
RSSI
RSSI
IN2
Scattering parameter (S–parameter) characterization of
L1
16
15
14
13
12
11
10
9
10n
1.0n
1.0n
1.0n
1.0n
1.0n
L1 – Coilcraft part number 146–09J08S
1.0k
330
100n
100n
Limiter 2
Output
27
10
10
+
+
V EE
V EE
V EE
3