MC13110B View Datasheet(PDF) - Motorola => Freescale

Part Name

Description

Manufacturer

MC13110B

Universal Cordless Telephone Subsystem IC

Motorola => Freescale 

MC13110A/B MC13111A/B

FIRST AND SECOND MIXER

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Mixer Description

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ The 1st and 2nd mixers are similar in design. Both are

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ double balanced to suppress the LO and the input

frequencies to give only the sum and difference frequencies

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ at the mixer output. Typically the LO is suppressed better

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ than –50 dB for the first mixer and better than –40 dB for the

Figure 14. First Mixer Output Impedance

Unit

Output Impedance

B IP3 = <0> (Set Low)

304 Ω // 3.7 pF

B IP3 = <1> (Set High)

300 Ω // 4.0 pF

second mixer. The gain of the 1st mixer has a –3.0 dB corner

at approximately 13 MHz and is used at a 10.7 MHz IF. It has

an output impedance of 300 Ω and matches to a typical

10.7 MHz ceramic filter with a source and load impedance of

330 Ω. A series resistor may be used to raise the impedance

for use with crystal filters. They typically have an input

impedance much greater than 330 Ω.

Figures 13, 14, and 16 represent the input and output

impedance for the first mixer. Notice that the input

single–ended and differential impedances are basically the

same. The output impedance as described in Figure 14 will

be used to match to a ceramic or crystal filter’s input

impedance. A typical ceramic filter input impedance is 330 Ω

while crystal filter input impedance is usually 1500 Ω. Exact

First Mixer

Figures 17 through 20 show the first mixer transfer curves

for the voltage conversion gain, output level, and

intermodulation. Notice that there is approximately 10 dB

linearity improvement when the “IP3 Increase” bit is set to

<1>. The “IP3 Increase” bit is a programmable bit as shown in

the Serial Programmable Interface section under the Rx

Counter Latch Register. The IP3 = <1> option will increase

the supply current demand by 1.3 mA.

Figure 13. First Mixer Input and Output Impedance

Schematic

Mix1 In

1st Mixer

RPI CPI CPO RPO

Mix1 Out

impedance matching to ceramic filters are not critical,

however, more attention needs to be given to the filter

characteristics of a crystal filter. Crystal filters are much

narrower. It is important to accurately match to these filters to

guaranty a reasonable response.

To find the IF bandwidth response of the first mixer refer to

Figure 22. The –3.0 dB bandwidth point is approximately 13

MHz. Figure 15 is a summary of the first mixer feedthrough

parameters.

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Figure 15. First Mixer Feedthrough Parameters

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Parameter

(dBm)

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 1st LO Feedthrough @ Mix1 In1

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 1st LO Feedthrough @ Mix1 Out

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ RF Feedthrough @ Mix1 Out with –30 dBm

–70.0

–55.5

–61.0

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Figure 16. First Mixer Input Impedance over Input Frequency

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ US Center Channels

France Center Channels

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Unit

49 MHz

46 MHz

41 MHz

26 MHz

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Single–Ended

1550 Ω // 3.7 pF

1560 Ω // 3.7 pF

1570 Ω // 3.8 pF

1650 Ω // 3.7 pF

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Differential

1600 Ω // 1.8 pF

1610 Ω // 1.8 pF

1670 Ω // 1.8 pF

1710 Ω // 1.8 pF

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Note: 11. Single–Endeddata is from measured results. Differentialdataisfromsimulatedresults.

20

MOTOROLA ANALOG IC DEVICE DATA

Share Link: