Transmitter (TX) in SerDes Systems: Function, Parameters, and Selection

Product Specifications

Technical details and manufacturing context for Transmitter (TX)

Definition

In a Serializer/Deserializer (SerDes) architecture, the Transmitter (TX) is a critical functional block. Its primary role is to accept parallel data from a digital source (e.g., a processor or FPGA), serialize it into a single, high-speed bitstream, encode it for transmission integrity (e.g., using 8b/10b encoding), and condition the electrical signal (e.g., adjusting voltage levels, pre-emphasis) for robust transmission over a physical channel such as a PCB trace, cable, or optical fiber. It is the counterpart to the Receiver (RX) and is essential for high-speed data communication links. The TX operates by first latching parallel data words into a buffer. A parallel-to-serial converter (often a multiplexer clocked by a high-frequency phase-locked loop) then sequentially outputs the bits. This serial stream typically passes through an encoder to add clock recovery information and maintain DC balance. Finally, a line driver amplifies and shapes the signal, often applying pre-emphasis to compensate for high-frequency attenuation in the transmission medium before outputting it. The TX is typically implemented in silicon (for integrated circuits) with copper interconnects. Key parameters include data rate (1–112 Gbps per lane, depending on standard such as IEEE 802.3), supply voltage (0.9–1.8 V), power consumption (50–500 mW per lane at max data rate), output swing (0.4–1.2 Vppd differential), rise/fall time (10–40 ps at 20–80%), jitter (0.5–5 ps RMS), operating temperature (-40 to 85 °C), ESD tolerance (2–8 kV HBM), package size (3–15 mm), pin count (16–256), input logic level (1.2–3.3 V), and output impedance (50–100 Ω). These values are directory reference ranges and must be confirmed for the specific model and application. Standards listed (e.g., IEEE 802.3, IEC 60068-2-1/2, IEC 61000-4-2, JEDEC JESD8) serve as procurement references, not proof of certification. Always verify model-specific values and standards with the legal manufacturer or supplier.

Working Principle

The TX operates by first latching parallel data words into a buffer. A parallel-to-serial converter (often a multiplexer clocked by a high-frequency phase-locked loop) then sequentially outputs the bits. This serial stream typically passes through an encoder to add clock recovery information and maintain DC balance. Finally, a line driver amplifies and shapes the signal, often applying pre-emphasis to compensate for high-frequency attenuation in the transmission medium before outputting it.

Common Materials

Silicon (for integrated circuits), Copper (for interconnects)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Data Rate	1–112 Gbps	Per lane, depending on standard (e.g., 10G, 25G, 112G)IEEE 802.3
Supply Voltage	0.9–1.8 V	Core and I/O domains; lower for advanced nodes
Power Consumption	50–500 mW	Per lane at max data rate; depends on equalization
Output Swing	0.4–1.2 Vppd	Differential peak-to-peak; adjustable for link length
Rise/Fall Time	10–40 ps	20–80% at max data rate; affects eye opening
Jitter (RMS)	0.5–5 ps	Total jitter; lower for higher data ratesIEEE 802.3
Operating Temperature	-40–85 °C	Industrial grade; extended range optionalIEC 60068-2-1/2
ESD Tolerance	2–8 kV	HBM on I/O pins; higher for robust designIEC 61000-4-2
Package Size	3–15 mm	Typical body size (e.g., QFN, BGA)JEDEC
Pin Count	16–256 pins	Depends on number of lanes and features
Input Logic Level	1.2–3.3 V	Compatible with parallel interfaceJEDEC JESD8
Output Impedance	50–100 Ω	Differential; matched to transmission line

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Parallel Input Buffer Part
Latches and temporarily holds the incoming parallel data words.

Material: Silicon
Serializer (MUX) Part
Converts the parallel data into a sequential high-speed serial bitstream.

Material: Silicon
Encoder (e.g., 8b/10b) Part
Encodes the data stream to ensure sufficient transitions for clock recovery and maintain DC balance.

Material: Silicon
Line Driver / Output Buffer Part
Amplifies and conditions the serial signal for transmission over the physical medium.

Material: Silicon
Phase-Locked Loop
Supplies the high-speed clock the multiplexer serialises against.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Serializer/Deserializer (SerDes)

View system integration details

Communication PHY (Physical Layer)

View system integration details

Manufacturers of Transmitter (TX)

Manufacturer profiles associated with Transmitter (TX).

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 6 September 2026

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Frequently Asked Questions

What is the primary function of a Transmitter (TX) in a SerDes system?

The TX converts parallel data from a digital source into a high-speed serial bitstream, encodes it for transmission integrity, and conditions the electrical signal to drive it over a physical channel such as a PCB trace, cable, or optical fiber.

What are typical data rates for a TX?

Typical data rates range from 1 to 112 Gbps per lane, depending on the standard (e.g., IEEE 802.3). The actual rate must be confirmed for the specific model and application.

How does the TX ensure signal integrity over long transmission lines?

The TX uses techniques such as pre-emphasis to boost high-frequency components, compensating for attenuation in the transmission medium. It also maintains proper output impedance and voltage swing to match the channel.

What should I verify before selecting a TX for my design?

Verify the data rate, supply voltage, power consumption, output swing, jitter, operating temperature, ESD tolerance, package size, pin count, input logic level, and output impedance against your system requirements. Always confirm these values with the legal manufacturer or supplier.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Not applicable (electronic component)
other spec:	Data rate: 1 Gbps to 112 Gbps, Supply voltage: 0.8V to 1.2V, Power consumption: < 500 mW
temperature:	-40°C to +125°C (operational range)

Transmitter (TX)

Product Specifications

Applied To / Applications

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