Part Number: M6759A1

Manufacturer: ALi

Description: Processors / Microcontrollers

Shipped from: Shenzhen/HK Warehouse

Stock Available: Check with us

The M6759A1 is a special version of the M6759 IC chip. The M6759 CMOS integrated circuit contains a phase comparator, a frequency divider, and a frequency synthesizer. Electronic devices like radios, modems, and other communication systems typically employ it to generate stable and precise frequencies.

M6759A1 Description

A type of electronic component known as an M6759 CMOS integrated circuit is a type of electronic component that is frequently used in communication systems to generate, manipulate, and process radio frequencies. This type of electronic component contains a frequency synthesizer, frequency divider, and phase comparator. In the following paragraphs, we will discuss the functions of each of these components and how they interact to form a sophisticated communication network.

Fundamentals of CMOS Integrated Circuits

To begin, let’s get familiar with the fundamentals. A CMOS integrated circuit is an electronic component that is made up of many transistors and other circuit parts that are integrated onto a single chip. CMOS is complementary metal oxide semiconductor, which refers to the material used to make the transistors. Because of its low power consumption, strong noise immunity, and relatively straightforward manufacturing process, CMOS technology is utilized extensively to produce integrated circuits.

Synthesizer of Many Frequencies

A frequency synthesizer is a circuit that generates an output frequency and can tune that frequency to a variety of various values. Typically, the components that make up the frequency synthesizer are referred to as a crystal oscillator, a phase-locked loop (PLL) circuit, and a frequency divider.

The crystal oscillator generates a frequency reference that is both consistent and accurate. As an electric current is passed through the oscillator’s quartz crystal, the crystal begins to vibrate at a predetermined frequency. This frequency determines the oscillator’s output. The frequency of the crystal is determined by the material qualities as well as the physical dimensions of the crystal.

A comparison is made between the output frequency and the reference frequency by the PLL circuit, which then adjusts the output frequency to match the reference frequency. In most cases, a phase detector, a loop filter, and a voltage-controlled oscillator make up the PLL circuit (VCO).

The phase detector compares the phase of the output frequency and the phase of the reference frequency, and it generates an error signal that shows the phase difference based on the comparison results. The loop filter refines the error signal, which generates a control voltage that may be applied to the VCO to modify its frequency. The control voltage influences the frequency output by the VCO, which is responsible for its generation.

Because of this, the circuit can provide a consistent and accurate frequency suitable for many applications, including those involving communication systems.

Frequency Divider

A circuit known as a frequency divider receives a frequency as an input and then creates an output frequency that is a fraction of the frequency received as an input. In most cases, the function of the frequency divider is to reduce the frequency of a signal so that it can be processed further or so that it can be matched to other components of a circuit.

A counter is what makes up the frequency divider. This counter keeps track of the number of input cycles and generates an output pulse after every N cycles of the input signal. For instance, if the frequency of the input signal is 10 MHz and the frequency divider is configured to split the frequency by 10, then the frequency of the output signal will be 1 MHz. The frequency can be divided by a variety of various values using the frequency divider, which enables it to provide a broad spectrum of output frequencies.

Comparator of the Phases

A circuit known as a phase comparator analyzes the phase difference between two signals and then generates an output signal displaying the phase difference. Applications like phase-locked loops, in which the circuit seeks to synchronize the phase of an output signal with a reference signal, are typical places to use the phase comparator.

A signal called an error signal is generated by the phase comparator after it has compared the phase of the output frequency to the phase of the reference frequency. This displays the phase difference. The output frequency can then be adjusted so that it is in sync with the reference frequency with the help of the error signal.

There are numerous variations of phase comparators, including the charge-pump phase detector, the edge-triggered flip-flop, and the XOR gate. Depending on the specific use, each kind comes with both benefits and drawbacks that are unique to themselves.

 M6759A1 Applications

In a wide variety of communication systems, CMOS integrated circuits are utilized. These integrated circuits often comprise a frequency synthesizer, frequency divider, and phase comparator. The following are some examples of common applications:

Radio receivers: A radio receiver use a frequency synthesizer to tune to a particular radio frequency and a frequency divider to down-convert the signal to a lower frequency. This allows the signal to be received by the radio receiver. To recover the initial audio signal, the signal that has been downconverted is first boosted and then demodulated.

Wireless communication systems: Wireless communication systems, such as cellular networks, Wi-Fi, and Bluetooth, use frequency synthesizers to generate radio frequencies for transmission and frequency dividers to match the frequencies to other parts of the circuit. Frequency synthesizers and frequency dividers are both examples of frequency modulation. The purpose of phase comparators in phase-locked loops is to synchronize the phase of the signal being transmitted with the reference signal being received by the receiver.

Radar systems: Radar systems generate high-frequency signals using frequency synthesizers, which are then broadcast and received by the radar antenna. To prepare the received signal for further processing, frequency dividers are utilized. On the other hand, phase comparators are utilized to synchronize the phase of the transmitted signal with the phase of the received signal.

Instrumentation for testing and measuring: Instrumentation for testing and measuring, such as signal generators and spectrum analyzers, use frequency synthesizers to generate accurate test signals and frequency divisions to break down frequency readings for further analysis. To ensure the consistency and correctness of the test signals, phase comparators are utilized in constructing phase-locked loops.


In summary, a CMOS integrated circuit containing a frequency synthesizer, frequency divider, and phase comparator is a powerful electronic component commonly used in communication systems to generate, manipulate, and process radio frequencies. By combining these three functions into a single integrated circuit, designers can create complex communication systems that can generate, manipulate, and process radio frequencies in a compact and efficient manner.

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