電流反饋架構(gòu)在寬闊的帶寬上最大化設(shè)計(jì)靈活性 2008年6月10日達(dá)拉斯消息，德州儀器于當(dāng)天宣布推出一個(gè)雙信道，高速電流反饋放大器。該設(shè)備擁有70％多的帶寬，超過競(jìng)爭(zhēng)設(shè)備，利用高線性提供快速信號(hào)調(diào)節(jié)，實(shí)現(xiàn)最小化變形，實(shí)現(xiàn)信號(hào)保真度和簡(jiǎn)易的過濾度。放大器提供了寬泛的電壓選擇和大量的獲利能力，并為工程師帶來靈活性，以調(diào)整參數(shù)適應(yīng)特殊的需求，如針對(duì)差分信號(hào)的高獲得性；用于低功耗的高輸出電壓和輸出電流。此外，設(shè)備的最優(yōu)化對(duì)稱包使設(shè)計(jì)用于有效的精確的精度射頻放大器，高速的隨意波形輸出驅(qū)動(dòng)器，寬帶模擬數(shù)字轉(zhuǎn)換器（ADC）驅(qū)動(dòng)器和有效的過濾器。（更多信息請(qǐng)登錄：www.ti.com/opa2695-pr ） 電流反饋架構(gòu)優(yōu)化帶寬斜率并最小化變形 不像傳統(tǒng)的電壓反饋或是完全的差分放大器，OPA2695為高速應(yīng)用提供了新層次性能。由于其電流反饋架構(gòu)，OPA2695可傳送850 MHz的帶寬，2900 V/µs的回轉(zhuǎn)比率，實(shí)現(xiàn)高速信號(hào)連接。 該架構(gòu)還提供寬闊的帶寬能力，以電壓反饋架構(gòu)獲得更高的利潤(rùn)。作為對(duì)比，全部差分?jǐn)U大器，對(duì)于差分信號(hào)路徑來說很受歡迎，都是基于一個(gè)電壓反饋架構(gòu)，在降低帶寬的情況下實(shí)現(xiàn)大利潤(rùn)。 OPA2695將電流反饋架構(gòu)與優(yōu)化的差分針腳相結(jié)合，可獲得豐厚的增益和帶寬，維護(hù)高線性，低諧波變形級(jí)別，減輕設(shè)計(jì)過程。針腳提供了高級(jí)對(duì)稱信號(hào)通道，在芯片的對(duì)面帶有輸入和輸出針腳，最大化的放大了PC板布局。 提供電壓選擇 提高設(shè)計(jì)靈活性 此外，設(shè)計(jì)師們還擁有了提供單電源（3.5 V到12 V）或雙電源（+/-1.75 V到+/-6 V）的靈活性，使OPA2695更適合他們的要求。例如，當(dāng)提供的電壓在±5 V，獲利在+8 V/V時(shí)，OPA2695可傳送大量的輸出電壓沖力（+/-4.1 V）或120 mA 8.2 Vpp發(fā)射或下沉輸出驅(qū)動(dòng)電流進(jìn)入ADC，用于精確的數(shù)字化。 二選一地，在提供+5 V的較低單個(gè)電源電壓時(shí)，當(dāng)仍在傳送+/-90 mA輸出電流3.4Vpp時(shí)，設(shè)備可節(jié)省功率用于功率靈敏性應(yīng)用，如手持式便攜設(shè)備。進(jìn)一步降低功率損耗，降低一個(gè)的功率，可減少靜電流損耗至80 µA。 OPA2695擴(kuò)展了TI的高速的、電流反饋擴(kuò)大器組合，能提供行業(yè)最寬的帶寬。提供包括以下幾個(gè)部分： 更多信息或是下載最新放大器或數(shù)據(jù)轉(zhuǎn)換器選擇指南，請(qǐng)登錄：www.ti.com/amplifier [font=times]original text [/font] [font=times][color=#708090]Current feedback architecture delivers larger gains at wide bandwidths to maximize design flexibility DALLAS （June 10, 2008） - Texas Instruments Incorporated （TI） （NYSE: TXN） introduced today a dual-channel, high-speed current feedback amplifier. The device features 70 percent greater bandwidth gain at +2 V/V than competitive devices, providing fast signal conditioning with the highest linearity to minimize distortion for better signal fidelity and easier filtering. The amplifier offers wide supply voltage options and large gain capability, giving engineers the flexibility to adjust the parameters to address the specific need, such as high gain for differential signals or high output voltage or current for low power consumption. In addition, the device’s optimized symmetrical package eases layout for cost-effective precision IF amplifiers, high-speed arbitrary waveform output drivers, wideband analog-to-digital converter （ADC） drivers and active filters. （For more information see www.ti.com/opa2695-pr.） Current feedback architecture optimizes bandwidth and slew rate and minimizes distortion Unlike traditional voltage feedback or fully differential amplifiers, the OPA2695 offers a new level of performance for high-speed applications. Due to its current feedback architecture, the OPA2695 can deliver a high bandwidth of 850 MHz at a gain of +2 V/V and a fast slew rate of 2900 V/µs to process high-speed signals. The architecture also provides wider bandwidth capability at much higher gains than can be achieved with a voltage feedback architecture. In contrast, fully differential amplifiers, which are popular for differential signal paths and are based on a voltage feedback architecture, suffer from reduced bandwidths at larger gains. The OPA2695 combines the current-feedback architecture with an optimized differential pin-out, which provides superior gain and bandwidth, maintains high linearity with low harmonic distortion levels, and eases the design process. The pin-out gives super-symmetrical signal paths with input and output pins on opposite sides of the chip to greatly simplify PC board layout. Supply voltage options increase design flexibility In addition, designers have the flexibility to provide a single supply voltage （3.5 V to 12 V） or a dual supply voltage （+/-1.75 V to +/-6 V） to the OPA2695 to suit their requirements. For example, with a supply voltage of ±5 V and gain of +8 V/V, the OPA2695 can deliver a large output voltage swing of +/-4.1 V or 8.2 Vpp with a 120 mA sourcing or sinking output drive current into an ADC for accurate digitization. Alternatively, at a lower single supply voltage of +5 V, the device can save power while still delivering +/-90 mA output current with a 3.4 Vpp for power-sensitive applications, such as handheld portable devices. To further reduce power consumption, a power down option is also available, which reduces the quiescent current consumption to 80 µA. The OPA2695 extends TI‘s high-speed, current feedback amplifier portfolio, which offers the industry‘s widest bandwidth. [/color][/font]