3.5GHz wireless local loop transceiver RF chip

3.5GHz wireless local loop transceiver RF chip

Abstract: This article provides a block diagram of a 3.5GHz wireless local loop (WLL) transceiver RF chip. The MAX2645 SiGe low noise amplifier (LNA) provides 25dB digital logic-controlled gain steps. The MAX2684 can be up-converted or down-converted from 1GHz to 1GHz IF. The MAX2620 is a voltage-controlled oscillator (VCO) with double-buffered output. The VCO buffer amplifiers MAX2472 and MAX2473 have high reverse isolation and keep harmonic components at -25dBc.

More information: Wireless product web application technical support figure 1.
PDF file of the circuit diagram (PDF, 86K) MAX2645: 3.4GHz to 3.8GHz SiGe low noise amplifier / PA predriver / VCO buffer MAX2645 is a versatile, low noise, high linearity amplifier designed for use from 3.4GHz to 3.8GHz wireless local loop (WLL), wireless broadband access and digital microwave wireless applications. This RF chip has an externally adjustable bias control that can be set with a resistor, allowing users to reduce current consumption while meeting the minimum linearity requirements. The RF chip's high gain, low noise performance, and adjustable input third-order intermodulation point (IIP3) performance can be used as a low-noise amplifier LNA in receivers, high IP3 amplifiers, PA pre-drivers in transmitters, or this Oscillation (LO) buffer.

The MAX2645 RF chip has logic level gain control, which provides 25dB step attenuation, which can improve IIP3 performance at high input signal levels. The supply current is reduced from 9mA in high gain mode to 3mA in low gain mode. The LNA also has a logic-controlled shutdown mode, and the supply current can be reduced to less than 0.1µA. Please refer to the Quick View MAX2645 data sheet SiGe LNA for more detailed information.

ApplicaTIon Circuit
Supply Current (mA)
Gain (dB)
Noise Figure (dB)
Input IP3 (dBm)
High Gain Mode
Low Gain Mode
High Gain Mode
Low Gain Mode
High Gain Mode
Low Gain Mode
High Gain Mode
Low Gain Mode
Low NF LNA
9.2
2.7
14.4
-9.7
2.3
15.5
+4
+13
High IIP3 LNA
9.2
2.7
14.9
-10.7
2.6
16
+10.0
+15.5
PA Predriver
12
3.6
15.2
-9.7
2.6
16
+11.8
+16.2
MAX2683 / MAX2684: 3.5GHz down-converter and up-converter, both with selectable LO frequency multipliers Performance, low cost RF chip. The MAX2683 is optimized for down-conversion to an intermediate frequency of 100MHz to 400MHz, allowing high-end and low-end local oscillator (LO) injection. The MAX2684 is optimized for frequency conversion from 800MHz to 1000MHz, allowing low-end LO injection. Logic level control can enable the frequency multiplier inside the two chips, which allows the external local oscillator signal source to work at full frequency or 1/2 frequency. Built-in LO filter can reduce LO harmonic components and clutter mixing. Please refer to the MAX2683 / MAX2684 in the application note "MAX2683 Low-Cost High-Performance 3.5GHz Upconverter" for the performance and application information of the upconverter.

The MAX2683 / MAX2684 RF chip has an internally adjustable bias control, which can be set with a single resistor, allowing users to compromise between supply current and linearity to optimize system performance. The two RF chips use a double-balanced Gilbert cell structure, with single-ended RF and LO inputs and differential open-collector IF output ports. The differential IF port provides a broadband and flexible interface for single-ended or differential applications.

The working voltage of the MAX2683 / MAX2684 RF chip is a single power supply + 2.7V to + 5.5V. In order to obtain the best performance at 3.5GHz, the two chips are available in 16-pin TSSOP-EP packages with exposed pads. Please refer to the Quick View MAX2683 / MAX2684 data sheet for detailed information. MAX2680 / MAX2681 / MAX2682 / MAX2690: 400MHz to 2.5GHz low-noise (SiGe) downconverter The MAX2680 / MAX2681 / MAX2682 / MAX2690 miniature, low-cost, low-noise downconverter is designed for low-voltage operation and is ideal for mobile communications Used in equipment. The signal at the RF output port is mixed with the signal at the local oscillator (LO) port through a double-balanced mixer. The RF input frequency of these four down-converters can work from 400MHz to 2500MHz, and down-convert to the intermediate frequency output frequency of 10MHz to 500MHz.

The operating voltage of the MAX2680 / MAX2681 / MAX2682 RF chip is a single power supply + 2.7V to + 5.5V, which can be powered by a 3-cell NiCd battery pack or a single-cell lithium-ion battery. These three RF chips provide a wide range of power supply current and input intermodulation (IIP3) level values ​​to optimize system performance. In addition, each chip has a low-power shutdown mode in which the typical operating current is less than 0.1µA. Refer to the MAX2680 / MAX2681 / MAX2682 data sheet for IIP3 and operating current performance data.

The MAX2680 / MAX2681 / MAX2682 RF chips are produced using high-frequency, low-noise, and advanced SiGe processes, and are packaged in a space-saving 6-pin SOT23 package.

The MAX2690 has a differential IF port that provides good linearity and low local oscillator leakage. It is also compatible with applications that use differential IF filters (such as CDMA cellular phones). The mixer noise figure is 10dB at 900MHz.

The MAX2690 consumes 16mA at VCC = 3V and can operate from + 2.7V to + 5.5V. The logic-controlled shutdown mode reduces the supply current to 1µA, so it is suitable for battery-operated devices. This chip is packaged in a tiny 10-pin µMAX. Please refer to the Quick View MAX2680 / MAX2681 / MAX2682 data sheet for detailed information. MAX2660 / MAX2661 / MAX2663 / MAX2671 / MAX2673: 400MHz to 2.5GHz upconverter MAX2660 / MAX2661 / MAX2663 / MAX2671 / MAX2673 miniature, low cost, low noise upconverter designed for low voltage operation, suitable for portable consumer equipment . The IF input port signal is mixed with the local oscillator port signal through a double-balanced mixer. The intermediate frequency input frequency of these upconverters can work between 40MHz and 500MHz, and upconvert to the output frequency of 2.5GHz.

These RF chips provide a wide range of power supply current and output intermodulation level values ​​to optimize system performance. The supply current is constant within the specified voltage range. In addition, each chip has a shutdown mode, in which the typical operating current is less than 1mA.

The MAX2660 / MAX2661 / MAX2663 / MAX2671 RF chips are available in a space-saving 6-pin SOT23 package. Applications requiring balanced IF ports can choose the MAX2673 in an 8-pin µMAX package. Please refer to the Quick View MAX2660 / MAX2661 / MAX2663 / MAX2671 / MAX2673 data sheet for details. MAX2620: 10MHz to 1050MHz VCO with buffered output. The MAX2620 VCO integrates two output buffers in a low-noise oscillator in a low-cost, plastic surface-mount, ultra-small µMAX package. This chip integrates the functions that discrete devices can achieve. When resonating with a resonant tank tuned by an external varactor, the oscillator can exhibit very low phase noise. Two buffered outputs can drive a mixer or prescaler. The buffer provides isolation between the load and the oscillator, and prevents the oscillator frequency from being pulled when the load impedance changes. During operation (VCC = 3.0V), the typical power consumption is only 27mW, and the standby mode drops to 0.3µW. The MAX2620 can work with a single supply voltage of + 2.7V to + 5.25V. Please refer to the Quick View MAX2620 data sheet for details. MAX2622 / MAX2623 / MAX2624: Monolithic Voltage Controlled Oscillator (VCO) The MAX2622 / MAX2623 / MAX2624 contain a voltage controlled oscillator (VCO), which combines an integrated oscillator and output buffer in a miniature 8-pin µMAX package together.

The on-chip integration of the inductance of the tuning circuit and the varactor diode greatly simplifies the application of the chip. In addition, the center frequency and frequency range of the oscillator are preset at the factory to ensure the frequency range of the relative control voltage. The external tuning voltage controls the oscillator frequency. The output signal is buffered by the amplifier (which can be matched to 50Ω using only capacitors) to provide higher output power and isolate the chip from load impedance changes.

The MAX2622 / MAX2623 / MAX2624 can operate from + 2.7V to + 3.3V power supplies and require only 9mA supply current. In shutdown mode, the supply current is reduced to 0.1µA. Please refer to the Quick View MAX2622 / MAX2623 / MAX2624 data sheet for details. MAX2472 / MAX2473: 500MHz to 2500MHz VCO buffer amplifier The MAX2472 / MAX2473 RF chip is a versatile, broadband, high reverse isolation buffer amplifier. The MAX2472 has dual open-collector outputs that can provide -5dBm power to 50Ω while ensuring harmonic suppression below -25dBc. The MAX2473 has a single-ended open collector output, and the bias control pin provides -10dBm to -2dBm power while maintaining harmonic suppression below -25dBc. The MAX2472 / MAX2473 combine high reverse isolation and low operating current, making them suitable for applications requiring low power consumption and high performance. The radio frequency chip has high input impedance and open collector output. The configuration is flexible and changeable, and it can be used in oscillators of various structures.

Both MAX2472 / MAX2473 RF chips can work with + 2.7V to + 5.5V power supply. When VCC = + 3.0V and -25dBm input power, the MAX2472 consumes 5.2mA, while the MAX2473 consumes only 2.7mA. Both RF chips are packaged in a space-saving miniature 6-pin SOT23 package. Please refer to the Quick View MAX2472 / MAX2473 data sheet for detailed information.

µMAX is a registered trademark of Maxim Integrated Products, Inc.


More RF chips

MAX2470

10MHz to 500MHz, VCO buffer amplifier, differential output

MAX2471

10MHz to 500MHz, VCO buffer amplifier, differential output

MAX2472

500MHz to 2500MHz, VCO buffer amplifier

MAX2473

500MHz to 2500MHz, VCO buffer amplifier

MAX2620

10MHz to 1050MHz, integrated RF oscillator with buffered output

MAX2622

Monolithic voltage controlled oscillator

MAX2623

Monolithic voltage controlled oscillator

MAX2624

Monolithic voltage controlled oscillator

MAX2645

3.4GHz to 3.8GHz, SiGe low noise amplifier / PA pre-driver

MAX2660

400MHz to 2.5GHz upconverter

MAX2661

400MHz to 2.5GHz upconverter

MAX2663

400MHz to 2.5GHz upconverter

MAX2671

400MHz to 2.5GHz upconverter

MAX2673

400MHz to 2.5GHz upconverter

MAX2680

400MHz to 2.5GHz, low noise, SiGe down-conversion mixer

MAX2681

400MHz to 2.5GHz, low noise, SiGe down-conversion mixer

MAX2682

400MHz to 2.5GHz, low noise, SiGe down-conversion mixer

MAX2683

3.5GHz down-conversion mixer, optional LO frequency multiplier

MAX2684

3.5GHz down-conversion mixer, optional LO frequency multiplier

MAX2690

Low noise, 2.5GHz down-conversion mixer

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