SA607DK/01,118 RF/IF and RFID

Series:	SA607
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
RF Type:	Cellular, ASK, FSK, NAMPS, NTACS
Frequency:	150MHz
Number of Mixers:	2
Gain:	17dB
Noise Figure:	6.2dB
Secondary Attributes:	Up Converter
Current - Supply:	4.2mA
Voltage - Supply:	2.7 V ~ 7 V
Package / Case:	20-LSSOP (0.173", 4.40mm Width)
Supplier Device Package:	20-SSOP

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Introduction to RF Mixers

RF mixers are devices that convert a single input signal to multiple output signals by combining the input signal with a second signal to generate new frequency components. In this way, an undesirable signal can be converted into a more desirable signal. Mixers are used in many electronic systems for activities such as IF and RF signal amplification.

SA607DK/01,118 Application Field and Working Principle

The SA607DK/01,118 IC is an RF mixer that integrates an active IF input stage, an active local oscillator buffer and active mixers with Gilbert cell based multipliers. It has a wide range of applications including FM and TV tuners, video converters, communication receivers and other consumer applications up to 1.2GHz.The SA607DK/01,118 RF mixer operates by converting one signal to multiple output signals. It uses two input signals – an RF signal and a local oscillator (LO) signal – that combine and produce nine output signals. The result is the sum of the RF and LO inputs, their difference, the second and third harmonics of the RF and LO signals, and the third harmonic of the sum or difference of RF and LO signals.The functioning of the SA607DK/01,118 can be understood using the following diagram:The RF input is connected to the RF input stage which consists of a single-ended amplifier and an active low-pass filter. This part of the circuit increases the level of the input signal and reduces harmonic distortion. This amplified signal is then fed into the IF input mixer, where it is mixed with the LO signal. The IF input mixer consists of an active Gilbert cell based multiplier and an active low pass filter.The output of the IF input mixer is then fed through the second order low pass filter which is made of resistors and capacitors. This low pass filter removes the unwanted higher frequency components from the signal. The output of this filter is fed into the output amplifiers which further amplify the signal and provide the necessary gain to the circuit.The output signal is then fed into the output mixer where it is mixed with the LO signal. The output mixer is also made up of an active Gilbert cell based multiplier and an active low-pass filter.The output of the output mixer is then fed to the output driver stage. This stage amplifies the signal and provides the necessary output voltage which is used to drive the load.Overall, the RF mixer is a versatile device that is designed to convert an input signal into multiple output signals. The SA607DK/01,118 is an example of an integrated circuit RF mixer that is designed to operate up to 1.2GHz. It uses two input signals – an RF signal and a local oscillator (LO) signal – that combine and produce nine output signals which can be used for a wide variety of applications.

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