ROHM. has filed a patent for an equalizer circuit featuring a variable gain equalizer circuit with transistors for gain adjustment and bias voltage control. The circuit includes input terminals, resistors, current sources, and a capacitor for enhanced performance. GlobalData’s report on ROHM gives a 360-degree view of the company including its patenting strategy. Buy the report here.

According to GlobalData’s company profile on ROHM, Under-screen biometric identification was a key innovation area identified from patents. ROHM's grant share as of January 2024 was 40%. Grant share is based on the ratio of number of grants to total number of patents.

Equalizer circuit with variable gain and dc gain control

Source: United States Patent and Trademark Office (USPTO). Credit: ROHM Co Ltd

The patent application (Publication Number: US20240039495A1) describes an equalizer circuit that includes a variable gain equalizer circuit and a first bias circuit generating a first bias voltage. The variable gain equalizer circuit consists of transistors, resistors, current sources, and a capacitor. The resistance of the third resistor in the circuit is variable, allowing for digital control. Additionally, the circuit can be integrated with multiple variable gain equalizer circuits in series, each with digitally controllable resistors and a common bias voltage supply.

Furthermore, the equalizer circuit features a variable capacitance capacitor and utilizes current D/A converters and I/V conversion circuits in the bias circuits to convert digital inputs into gradated current outputs for bias voltages. The circuit can also include a field effect transistor in the third resistor and a second bias circuit for supplying a second bias voltage to the transistor's gate. Overall, the equalizer circuit is designed to be integrally mounted on a single semiconductor substrate, offering a compact and efficient solution for equalization applications in various electronic devices.

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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.